Trial Outcomes & Findings for A Phase 2 Clinical Trial of VLA1553 in Healthy Children Aged 1 to 11 Years (NCT NCT06106581)

NCT ID: NCT06106581

Last Updated: 2026-08-13

Results Overview

Frequency and severity of solicited injection site and solicited systemic reactions within 14 days post-vaccination.

Recruitment status

COMPLETED

Study phase

PHASE2

Target enrollment

304 participants

Primary outcome timeframe

within 14 days post-vaccination

Results posted on

2026-08-13

Participant Flow

Participant milestones

Participant milestones
Measure
VLA1553 Half Dose
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Overall Study
STARTED
119
124
61
Overall Study
COMPLETED
115
122
60
Overall Study
NOT COMPLETED
4
2
1

Reasons for withdrawal

Reasons for withdrawal
Measure
VLA1553 Half Dose
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Overall Study
Withdrawal by Subject
1
0
1
Overall Study
Lost to Follow-up
2
1
0
Overall Study
Physician Decision
1
0
0
Overall Study
participant was out of town and was not back within the time window
0
1
0

Baseline Characteristics

A Phase 2 Clinical Trial of VLA1553 in Healthy Children Aged 1 to 11 Years

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure
VLA1553 Half Dose
n=119 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose
n=124 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control
n=61 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Total
n=304 Participants
Total of all reporting groups
Age, Continuous
5.0 years
STANDARD_DEVIATION 3.05 • n=1 Participants
5.0 years
STANDARD_DEVIATION 3.05 • n=1 Participants
5.1 years
STANDARD_DEVIATION 3.37 • n=1 Participants
5.0 years
STANDARD_DEVIATION 3.11 • n=2 Participants
Sex: Female, Male
Female
52 Participants
n=1 Participants
65 Participants
n=1 Participants
29 Participants
n=1 Participants
146 Participants
n=2 Participants
Sex: Female, Male
Male
67 Participants
n=1 Participants
59 Participants
n=1 Participants
32 Participants
n=1 Participants
158 Participants
n=2 Participants
Race/Ethnicity, Customized
American Indian or Alaska Native
0 Participants
n=1 Participants
2 Participants
n=1 Participants
0 Participants
n=1 Participants
2 Participants
n=2 Participants
Race/Ethnicity, Customized
Asian
0 Participants
n=1 Participants
0 Participants
n=1 Participants
0 Participants
n=1 Participants
0 Participants
n=2 Participants
Race/Ethnicity, Customized
Black or African American
42 Participants
n=1 Participants
34 Participants
n=1 Participants
12 Participants
n=1 Participants
88 Participants
n=2 Participants
Race/Ethnicity, Customized
White
0 Participants
n=1 Participants
1 Participants
n=1 Participants
0 Participants
n=1 Participants
1 Participants
n=2 Participants
Race/Ethnicity, Customized
Other
77 Participants
n=1 Participants
87 Participants
n=1 Participants
49 Participants
n=1 Participants
213 Participants
n=2 Participants

PRIMARY outcome

Timeframe: within 14 days post-vaccination

Population: Safety Population

Frequency and severity of solicited injection site and solicited systemic reactions within 14 days post-vaccination.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Number of Participants With Solicited Injection Site Reactions
12 Participants
8 Participants
7 Participants
6 Participants
7 Participants
0 Participants
3 Participants
1 Participants
1 Participants

PRIMARY outcome

Timeframe: within 14 days post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Severity of Solicited Injection Site Reactions
Grade 3
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
Severity of Solicited Injection Site Reactions
Grade 2
5 Participants
1 Participants
2 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
Severity of Solicited Injection Site Reactions
Grade 1
9 Participants
7 Participants
6 Participants
6 Participants
7 Participants
0 Participants
3 Participants
1 Participants
1 Participants
Severity of Solicited Injection Site Reactions
Grade 4
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants

PRIMARY outcome

Timeframe: within 14 days post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Number of Participants With Solicited Systemic Reactions
11 Participants
17 Participants
3 Participants
10 Participants
10 Participants
4 Participants
9 Participants
15 Participants
3 Participants

PRIMARY outcome

Timeframe: within 14 days post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Severity of Solicited Systemic Reactions
Grade 4
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
1 Participants
0 Participants
0 Participants
Severity of Solicited Systemic Reactions
Grade 3
0 Participants
0 Participants
0 Participants
0 Participants
3 Participants
0 Participants
1 Participants
1 Participants
0 Participants
Severity of Solicited Systemic Reactions
Grade 2
8 Participants
3 Participants
0 Participants
0 Participants
2 Participants
3 Participants
1 Participants
3 Participants
1 Participants
Severity of Solicited Systemic Reactions
Grade 1
6 Participants
15 Participants
3 Participants
10 Participants
9 Participants
1 Participants
7 Participants
13 Participants
2 Participants

SECONDARY outcome

Timeframe: within 28 days post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Number of Participants With Any Adverse Event (AE)
22 Participants
23 Participants
11 Participants
20 Participants
16 Participants
6 Participants
16 Participants
20 Participants
8 Participants

SECONDARY outcome

Timeframe: within 28 days post-vaccination

Population: Safety Population

In the Outcome measure "Severity of any AE", subjects may be represented in more than one AE category. Therefore, the total number of subjects with any AE may be lower than the sum of the numbers of subjects in the individual AE categories (solicited / unsolicited AE).

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Severity of Any Adverse Event (AE)
any solicited AE
17 Participants
20 Participants
9 Participants
14 Participants
12 Participants
4 Participants
10 Participants
15 Participants
3 Participants
Severity of Any Adverse Event (AE)
solicited AE - Grade 4
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
1 Participants
0 Participants
0 Participants
Severity of Any Adverse Event (AE)
solicited AE - Grade 3
0 Participants
0 Participants
0 Participants
0 Participants
3 Participants
0 Participants
1 Participants
1 Participants
0 Participants
Severity of Any Adverse Event (AE)
solicited AE - Grade 2
11 Participants
4 Participants
2 Participants
0 Participants
2 Participants
3 Participants
1 Participants
3 Participants
1 Participants
Severity of Any Adverse Event (AE)
solicited AE - Grade 1
6 Participants
16 Participants
7 Participants
14 Participants
7 Participants
1 Participants
7 Participants
11 Participants
2 Participants
Severity of Any Adverse Event (AE)
any unsolicited AE
10 Participants
13 Participants
6 Participants
12 Participants
11 Participants
5 Participants
12 Participants
13 Participants
6 Participants
Severity of Any Adverse Event (AE)
unsolicited AE - Grade 4
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
Severity of Any Adverse Event (AE)
unsolicited AE - Grade 3
1 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
1 Participants
0 Participants
0 Participants
Severity of Any Adverse Event (AE)
unsolicited AE - Grade 2
2 Participants
0 Participants
1 Participants
1 Participants
2 Participants
0 Participants
0 Participants
0 Participants
0 Participants
Severity of Any Adverse Event (AE)
unsolicited AE - Grade 1
7 Participants
13 Participants
5 Participants
11 Participants
9 Participants
5 Participants
11 Participants
13 Participants
6 Participants

SECONDARY outcome

Timeframe: until Month 6 (Day 180) and Month 12 (Day 365) post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Number of Participants With of Unsolicited AE
Month 12 - Day 365
25 Participants
31 Participants
12 Participants
30 Participants
24 Participants
16 Participants
29 Participants
33 Participants
17 Participants
Number of Participants With of Unsolicited AE
Month 6 - Day 180
25 Participants
25 Participants
11 Participants
27 Participants
20 Participants
13 Participants
27 Participants
28 Participants
14 Participants

SECONDARY outcome

Timeframe: until Month 6 (Day 180) and Month 12 (Day 365) post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Severity of Unsolicited AE
Month 6 - Grade 4
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
Severity of Unsolicited AE
Month 6 - Grade 3
1 Participants
2 Participants
0 Participants
1 Participants
0 Participants
0 Participants
3 Participants
2 Participants
0 Participants
Severity of Unsolicited AE
Month 6 - Grade 2
8 Participants
4 Participants
3 Participants
8 Participants
4 Participants
2 Participants
8 Participants
7 Participants
4 Participants
Severity of Unsolicited AE
Month 6 - Grade 1
16 Participants
19 Participants
8 Participants
18 Participants
16 Participants
11 Participants
16 Participants
19 Participants
10 Participants
Severity of Unsolicited AE
Month 12 - Grade 4
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
1 Participants
Severity of Unsolicited AE
Month 12 - Grade 3
1 Participants
4 Participants
1 Participants
2 Participants
0 Participants
0 Participants
3 Participants
2 Participants
0 Participants
Severity of Unsolicited AE
Month 12 - Grade 2
10 Participants
5 Participants
4 Participants
9 Participants
8 Participants
5 Participants
11 Participants
16 Participants
6 Participants
Severity of Unsolicited AE
Month 12 - Grade 1
14 Participants
22 Participants
7 Participants
19 Participants
16 Participants
11 Participants
15 Participants
15 Participants
10 Participants

SECONDARY outcome

Timeframe: until Month 6 (Day 180) and Month 12 (Day 365) post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Number of Participants With Any Serious Adverse Event (SAE)
Month 6 - Day 180
1 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
0 Participants
1 Participants
0 Participants
Number of Participants With Any Serious Adverse Event (SAE)
Month 12 - ay 365
1 Participants
2 Participants
0 Participants
1 Participants
0 Participants
0 Participants
0 Participants
2 Participants
1 Participants

SECONDARY outcome

Timeframe: 2 to 21 days post-vaccination

Population: Safety Population

Early onset AESI were defined as: 1. Fever (≥ 38.0 °c / 100.4 °f,) AND 2. symptoms suggesting acute (poly)arthralgia/arthritis, myalgia, neurological symptoms (e.g., for meningoencephalitis, acute encephalitis, headache, seizures), back pain, lymphadenopathy, cardiac or ocular symptoms (e.g., for uveitis and retinitis); OR one or more of the following signs and symptoms: macular to maculopapular rash (sometimes with cutaneous pruritus \[foot plant\]), pigmentary changes, bullous rash/ skin blistering, purpura, ecchymosis and 3. Onset of symptoms 2 to 21 days after vaccination AND 4. Duration of event ≥ 3 days.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=119 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=124 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=61 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Number of Participants With Any Early Onset Adverse Event of Special Interest (AESI)
3 Participants
0 Participants
0 Participants

SECONDARY outcome

Timeframe: 2 to 21 days post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=119 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=124 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=61 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Severity of Any Early Onset Adverse Event of Special Interest (AESI)
Grade 4
0 Participants
0 Participants
0 Participants
Severity of Any Early Onset Adverse Event of Special Interest (AESI)
Grade 3
0 Participants
0 Participants
0 Participants
Severity of Any Early Onset Adverse Event of Special Interest (AESI)
Grade 2
2 Participants
0 Participants
0 Participants
Severity of Any Early Onset Adverse Event of Special Interest (AESI)
Grade 1
1 Participants
0 Participants
0 Participants

SECONDARY outcome

Timeframe: Starting 22 days post-vaccination until end of trial, 12 months post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=119 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=124 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=61 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Number of Participants With Any Late Onset Adverse Event of Special Interest (AESI)
2 Participants
0 Participants
0 Participants

SECONDARY outcome

Timeframe: Starting 22 days post-vaccination until end of trial, 12 months post-vaccination

Population: Safety Population

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=119 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=124 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=61 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Severity of Any Late Onset Adverse Event of Special Interest (AESI)
Grade 4
0 Participants
0 Participants
0 Participants
Severity of Any Late Onset Adverse Event of Special Interest (AESI)
Grade 3
0 Participants
0 Participants
0 Participants
Severity of Any Late Onset Adverse Event of Special Interest (AESI)
Grade 2
1 Participants
0 Participants
0 Participants
Severity of Any Late Onset Adverse Event of Special Interest (AESI)
Grade 1
1 Participants
0 Participants
0 Participants

SECONDARY outcome

Timeframe: on Days 1, 4, 8 and 15 and beyond as applicable

Population: Viremia subset of the Safety Analysis Population including 124 participants.

Number of participants with viremic results, including quantifiable results and results below LLOQ, by visit and by pooled trial arm. Day 29 was only tested, if Day 15 was tested positive. Viremia is measured in genome copy equivalents per milliliter (GCE/mL). All quantifiable results and results below LLOQ (\< 3214.4 GCE/mL), but above the LOD, are considered "viremic". A result of "not detected" or below LOD (\<1071,4 GCE/mL) is included as "non-viremic".

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=50 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=53 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 1 - Day 1 : Quantifiable
0 Participants
0 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 1 - Day 1 : Below LLOQ
0 Participants
0 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 2 - Day 4 : Quantifiable
12 Participants
23 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 2 - Day 4 : Below LLOQ
6 Participants
10 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 3 - Day 8 : Quantifiable
10 Participants
8 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 3 - Day 8 : Below LLOQ
6 Participants
5 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 4 - Day 15 : Quantifiable
1 Participants
0 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 4 - Day 15 : Below LLOQ
0 Participants
0 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 5 - Day 29 : Quantifiable
0 Participants
0 Participants
0 Participants
Assessment of Viremia on Days 1, 4, 8 and 15
Visit 5 - Day 29 : Below LLOQ
0 Participants
0 Participants
0 Participants

SECONDARY outcome

Timeframe: on Day 1, Day 15, Day 29, Day 85, Day 180 and Month 12 post-vaccination

Population: Immunogenicity Population - seronegative at baseline (μPRNT50 ≤ 40)

Immune Response provided by Geometric Mean Titers (GMTs) in Baseline Seronegative Participants pooled by Trial Arm up to 12 months post vaccination.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=109 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=116 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Immune Response in Baseline Seronegative Participants as Measured by CHIKV-specific Neutralizing Antibody Titers
Visit 1 - Day 1
10.1 titer
Interval 9.9 to 10.3
10.0 titer
Interval 10.0 to 10.0
10.3 titer
Interval 9.9 to 10.7
Immune Response in Baseline Seronegative Participants as Measured by CHIKV-specific Neutralizing Antibody Titers
Visit 4 - Day 15
1046.1 titer
Interval 726.6 to 1506.0
1949.9 titer
Interval 1513.7 to 2511.8
10.2 titer
Interval 9.8 to 10.7
Immune Response in Baseline Seronegative Participants as Measured by CHIKV-specific Neutralizing Antibody Titers
Visit 5 - Day 29
1845.4 titer
Interval 1300.3 to 2618.8
2860.6 titer
Interval 2267.8 to 3608.3
10.3 titer
Interval 9.9 to 10.8
Immune Response in Baseline Seronegative Participants as Measured by CHIKV-specific Neutralizing Antibody Titers
Visit 6 - Day 85
630.8 titer
Interval 465.8 to 854.4
1031.5 titer
Interval 830.6 to 1281.0
10.0 titer
Interval 10.0 to 10.0
Immune Response in Baseline Seronegative Participants as Measured by CHIKV-specific Neutralizing Antibody Titers
Visit 7 - Day 180
514.2 titer
Interval 383.2 to 690.0
813.7 titer
Interval 658.5 to 1005.4
10.0 titer
Interval 10.0 to 10.0
Immune Response in Baseline Seronegative Participants as Measured by CHIKV-specific Neutralizing Antibody Titers
Visit 8 - Day 365
798.7 titer
Interval 573.4 to 1112.5
1355.7 titer
Interval 1071.5 to 1715.2
10.5 titer
Interval 9.9 to 11.0

SECONDARY outcome

Timeframe: on Day 1, Day 15, Day 29, Day 85, Day 180 and Month 12 post-vaccination

Population: Per Protocol Population

Immune Response provided by Geometric Mean Titers (GMTs) by Visit, by Age Group and Trial Arm up to 12 months post vaccination.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=29 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=36 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=13 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=39 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=38 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Immune Response as Measured by CHIKV-specific Neutralizing Antibody Titers by Age Group and Trial Arm.
Visit 1 - Day 1
10.0 titer
Interval 10.0 to 10.0
10.0 titer
Interval 10.0 to 10.0
10.7 titer
Interval 9.3 to 12.3
10.3 titer
Interval 9.7 to 10.8
10.0 titer
Interval 10.0 to 10.0
10.0 titer
Interval 10.0 to 10.0
10.0 titer
Interval 10.0 to 10.0
10.0 titer
Interval 10.0 to 10.0
10.4 titer
Interval 9.6 to 11.1
Immune Response as Measured by CHIKV-specific Neutralizing Antibody Titers by Age Group and Trial Arm.
Visit 4 - Day 15
836.0 titer
Interval 443.2 to 1576.7
2214.5 titer
Interval 1716.3 to 2857.2
10.0 titer
Interval 10.0 to 10.0
1437.4 titer
Interval 836.1 to 2471.1
2275.4 titer
Interval 1518.3 to 3410.3
10.0 titer
Interval 10.0 to 10.0
960.3 titer
Interval 462.7 to 1993.1
1474.5 titer
Interval 808.7 to 2688.8
10.7 titer
Interval 9.3 to 12.3
Immune Response as Measured by CHIKV-specific Neutralizing Antibody Titers by Age Group and Trial Arm.
Visit 5 - Day 29
1979.1 titer
Interval 941.9 to 4158.4
3443.6 titer
Interval 2957.0 to 4010.3
10.0 titer
Interval 10.0 to 10.0
2170.2 titer
Interval 1304.9 to 3609.2
3134.8 titer
Interval 2108.4 to 4660.7
10.0 titer
Interval 10.0 to 10.0
1439.2 titer
Interval 730.0 to 2837.1
2161.7 titer
Interval 1235.0 to 3783.7
11.0 titer
Interval 9.6 to 12.5
Immune Response as Measured by CHIKV-specific Neutralizing Antibody Titers by Age Group and Trial Arm.
Visit 6 - Day 85
634.5 titer
Interval 347.7 to 1157.7
1240.8 titer
Interval 1003.9 to 1533.6
10.0 titer
Interval 10.0 to 10.0
763.4 titer
Interval 497.7 to 1170.9
1073.7 titer
Interval 763.8 to 1509.2
10.0 titer
Interval 10.0 to 10.0
517.5 titer
Interval 277.9 to 963.8
831.1 titer
Interval 500.1 to 1381.1
10.0 titer
Interval 10.0 to 10.0
Immune Response as Measured by CHIKV-specific Neutralizing Antibody Titers by Age Group and Trial Arm.
Visit 7 - Day 180
573.8 titer
Interval 315.9 to 1042.1
835.4 titer
Interval 648.3 to 1076.7
10.0 titer
Interval 10.0 to 10.0
468.0 titer
Interval 313.2 to 699.4
872.4 titer
Interval 635.4 to 1197.8
10.0 titer
Interval 10.0 to 10.0
506.0 titer
Interval 272.4 to 940.0
820.1 titer
Interval 517.8 to 1298.9
10.0 titer
Interval 10.0 to 10.0
Immune Response as Measured by CHIKV-specific Neutralizing Antibody Titers by Age Group and Trial Arm.
Visit 8 - Day 365
693.3 titer
Interval 376.4 to 1277.2
1451.0 titer
Interval 1102.4 to 1909.9
10.7 titer
Interval 9.3 to 12.3
858.6 titer
Interval 524.5 to 1405.4
1382.2 titer
Interval 975.0 to 1959.5
10.0 titer
Interval 10.0 to 10.0
814.0 titer
Interval 400.4 to 1654.7
1242.6 titer
Interval 703.3 to 2195.8
10.8 titer
Interval 9.6 to 12.2

SECONDARY outcome

Timeframe: on Day 1, Day 15, Day 29, Day 85, Day 180 and Month 12 post-vaccination

Population: Per Protocol Population

Immune Response provided by Geometric Mean Titers (GMTs) by Visit, pooled by Trial Arm up to 12 months post vaccination.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=107 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=115 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Immune Response Measured by CHIKV-specific Neutralizing Antibody Titers Pooled by Dose
Visit 1 - Day 1
10.1 titer
Interval 9.9 to 10.3
10.0 titer
Interval 10.0 to 10.0
10.3 titer
Interval 9.9 to 10.7
Immune Response Measured by CHIKV-specific Neutralizing Antibody Titers Pooled by Dose
Visit 4 - Day 15
1073.6 titer
Interval 748.1 to 1540.7
1944.8 titer
Interval 1506.5 to 2510.8
10.2 titer
Interval 9.8 to 10.8
Immune Response Measured by CHIKV-specific Neutralizing Antibody Titers Pooled by Dose
Visit 5 - Day 29
1829.3 titer
Interval 1280.8 to 2612.8
2843.6 titer
Interval 2247.1 to 3598.5
10.3 titer
Interval 9.9 to 10.8
Immune Response Measured by CHIKV-specific Neutralizing Antibody Titers Pooled by Dose
Visit 6 - Day 85
631.4 titer
Interval 463.5 to 860.2
1025.9 titer
Interval 824.8 to 1276.2
10.0 titer
Interval 10.0 to 10.0
Immune Response Measured by CHIKV-specific Neutralizing Antibody Titers Pooled by Dose
Visit 7 - Day 180
508.5 titer
Interval 377.1 to 685.8
842.5 titer
Interval 689.1 to 1030.1
10.0 titer
Interval 10.0 to 10.0
Immune Response Measured by CHIKV-specific Neutralizing Antibody Titers Pooled by Dose
Visit 8 - Day 365
794.5 titer
Interval 566.8 to 1113.7
1353.4 titer
Interval 1067.5 to 1715.8
10.5 titer
Interval 9.9 to 11.0

SECONDARY outcome

Timeframe: at Day 15, Day 29, Day 85, Day 180 and Month 12

Population: Immunogenicity Population - seronegative at baseline (μPRNT50 ≤ 40)

Percentage of participants seronegative at baseline with Seroconversion (defined as \>4-fold titer change compared to baseline) by Visit Pooled by Trial Arm

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=109 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=116 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants Seronegative at Baseline With Seroconversion as Compared to Baseline
Visit 4 - Day 15
95 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline With Seroconversion as Compared to Baseline
Visit 5 - Day 29
98 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline With Seroconversion as Compared to Baseline
Visit 6 - Day 85
94 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline With Seroconversion as Compared to Baseline
Visit 7 - Day 180
96 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline With Seroconversion as Compared to Baseline
Visit 8 - Day 365
95 Participants
110 Participants
0 Participants

SECONDARY outcome

Timeframe: at Day 15, Day 29, Day 85, Day 180 and Month 12

Population: Immunogenicity Population - seropositive at baseline (μPRNT50 \> 40)

Percentage of participants seropositive at baseline with Seroconversion (defined as \>4-fold titer change compared to baseline) by Visit Pooled by Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=9 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=7 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=8 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants Seropositive at Baseline With Seroconversion as Compared to Baseline
Visit 4 - Day 15
0 Participants
0 Participants
0 Participants
Percentage of Participants Seropositive at Baseline With Seroconversion as Compared to Baseline
Visit 5 - Day 29
0 Participants
0 Participants
0 Participants
Percentage of Participants Seropositive at Baseline With Seroconversion as Compared to Baseline
Visit 6 - Day 85
0 Participants
0 Participants
0 Participants
Percentage of Participants Seropositive at Baseline With Seroconversion as Compared to Baseline
Visit 7 - Day 180
0 Participants
0 Participants
1 Participants
Percentage of Participants Seropositive at Baseline With Seroconversion as Compared to Baseline
Visit 8 - Day 365
0 Participants
0 Participants
0 Participants

SECONDARY outcome

Timeframe: at Day 15, Day 29, Day 85, Day 180 and Month 12

Population: Per Protocol Population

Percentage of participants with Seroconversion (defined as \>4-fold titer change compared to baseline) by Visit by Age Group and Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=29 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=36 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=13 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=39 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=38 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants With Seroconversion as Compared to Baseline Stratified by Age Stratum
Visit 4 - Day 15
26 Participants
36 Participants
0 Participants
36 Participants
38 Participants
0 Participants
31 Participants
35 Participants
0 Participants
Percentage of Participants With Seroconversion as Compared to Baseline Stratified by Age Stratum
Visit 5 - Day 29
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
33 Participants
35 Participants
0 Participants
Percentage of Participants With Seroconversion as Compared to Baseline Stratified by Age Stratum
Visit 6 - Day 85
26 Participants
35 Participants
0 Participants
35 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants With Seroconversion as Compared to Baseline Stratified by Age Stratum
Visit 7 - Day 180
26 Participants
36 Participants
0 Participants
38 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants With Seroconversion as Compared to Baseline Stratified by Age Stratum
Visit 8 - Day 365
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
30 Participants
35 Participants
0 Participants

SECONDARY outcome

Timeframe: at Day 15, Day 29, Day 85, Day 180 and Month 12

Population: Per Protocol Population

Percentage of participants with Seroconversion (defined as \>4-fold titer change compared to baseline) by Visit Pooled by Trial Arm

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=107 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=115 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants With Seroconversion as Compared to Baseline by Dose
Visit 8 - Day 365
93 Participants
109 Participants
0 Participants
Percentage of Participants With Seroconversion as Compared to Baseline by Dose
Visit 4 - Day 15
93 Participants
109 Participants
0 Participants
Percentage of Participants With Seroconversion as Compared to Baseline by Dose
Visit 5 - Day 29
96 Participants
109 Participants
0 Participants
Percentage of Participants With Seroconversion as Compared to Baseline by Dose
Visit 6 - Day 85
91 Participants
109 Participants
0 Participants
Percentage of Participants With Seroconversion as Compared to Baseline by Dose
Visit 7 - Day 180
94 Participants
110 Participants
0 Participants

SECONDARY outcome

Timeframe: on Day 15, Day 29, Day 85, Day 180 and Month 12 post-vaccination

Population: Immunogenicity Population -Seronegative at Baseline (μPRNT50 ≤ 40)

Percentage of Participants with Seroresponse for CHIKV-Specific Neutralizing Antibody Titers (defined as PRNT50 ≥150) by Visit Pooled by Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=109 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=116 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants Seronegative at Baseline With a Seroresponse (Defined as PRNT50 ≥150 for Baseline Negative Participants) by Dose
Visit 4 - Day 15
94 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline With a Seroresponse (Defined as PRNT50 ≥150 for Baseline Negative Participants) by Dose
Visit 5 - Day 29
97 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline With a Seroresponse (Defined as PRNT50 ≥150 for Baseline Negative Participants) by Dose
Visit 6 - Day 85
92 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline With a Seroresponse (Defined as PRNT50 ≥150 for Baseline Negative Participants) by Dose
Visit 7 - Day 180
95 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline With a Seroresponse (Defined as PRNT50 ≥150 for Baseline Negative Participants) by Dose
Visit 8 - Day 365
92 Participants
109 Participants
0 Participants

SECONDARY outcome

Timeframe: on Day 15, Day 29, Day 85, Day 180 and Month 12 post-vaccination

Population: Per Protocol Population

Percentage of Participants with Seroresponse for CHIKV-Specific Neutralizing Antibody Titers (defined as PRNT50 ≥150) by Visit by Age Group and Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=29 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=36 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=13 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=39 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=38 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants With a Seroresponse Stratified by Age Stratum
Visit 6 - Day 85
26 Participants
35 Participants
0 Participants
34 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants With a Seroresponse Stratified by Age Stratum
Visit 4 - Day 15
26 Participants
36 Participants
0 Participants
36 Participants
38 Participants
0 Participants
30 Participants
35 Participants
0 Participants
Percentage of Participants With a Seroresponse Stratified by Age Stratum
Visit 5 - Day 29
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
32 Participants
35 Participants
0 Participants
Percentage of Participants With a Seroresponse Stratified by Age Stratum
Visit 7 - Day 180
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants With a Seroresponse Stratified by Age Stratum
Visit 8 - Day 365
26 Participants
35 Participants
0 Participants
36 Participants
38 Participants
0 Participants
28 Participants
35 Participants
0 Participants

SECONDARY outcome

Timeframe: on Day 15, Day 29, Day 85, Day 180 and Month 12 post-vaccination

Population: Per Protocol Population

Percentage of Participants with Seroresponse for CHIKV-Specific Neutralizing Antibody Titers (defined as PRNT50 ≥150) by Visit Pooled by Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=107 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=115 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants With a Seroresponse Stratified by Dose
Visit 5 - Day 29
95 Participants
109 Participants
0 Participants
Percentage of Participants With a Seroresponse Stratified by Dose
Visit 6 - Day 85
90 Participants
109 Participants
0 Participants
Percentage of Participants With a Seroresponse Stratified by Dose
Visit 7 - Day 180
93 Participants
110 Participants
0 Participants
Percentage of Participants With a Seroresponse Stratified by Dose
Visit 8 - Day 365
90 Participants
108 Participants
0 Participants
Percentage of Participants With a Seroresponse Stratified by Dose
Visit 4 - Day 15
92 Participants
109 Participants
0 Participants

SECONDARY outcome

Timeframe: at Days 15, 29, 85, 180 and at Month 12 post-vaccination

Population: Immunogenicity Population -Seronegative at Baseline (μPRNT50 ≤ 40)

Fold Change for CHIKV-Specific Neutralizing Antibody Titers in seronegative Participants by Visit Pooled by Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=109 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=116 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Participants Seronegative at Baseline
Visit 4 - Day 15
103.6 fold change
Interval 71.9 to 149.3
195.0 fold change
Interval 151.4 to 251.2
1.0 fold change
Interval 0.9 to 1.1
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Participants Seronegative at Baseline
Visit 5 - Day 29
182.8 fold change
Interval 128.7 to 259.7
286.1 fold change
Interval 226.8 to 360.8
1.0 fold change
Interval 0.9 to 1.1
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Participants Seronegative at Baseline
Visit 6 - Day 85
62.5 fold change
Interval 46.1 to 84.6
103.1 fold change
Interval 83.1 to 128.1
1.0 fold change
Interval 0.9 to 1.1
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Participants Seronegative at Baseline
Visit 7 - Day 180
50.9 fold change
Interval 37.9 to 68.4
81.4 fold change
Interval 65.9 to 100.5
1.0 fold change
Interval 0.9 to 1.0
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Participants Seronegative at Baseline
Visit 8 - Day 365
79.1 fold change
Interval 56.7 to 110.3
135.6 fold change
Interval 107.2 to 171.5
1.0 fold change
Interval 0.9 to 1.0

SECONDARY outcome

Timeframe: at Days 15, 29, 85, 180 and at Month 12 post-vaccination

Population: Immunogenicity Population -Seropositive at Baseline (μPRNT50 \>40)

Fold Change for CHIKV-Specific Neutralizing Antibody Titers in seropositive Participants by Visit Pooled by Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=9 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=7 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=8 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Seropositive Participants
Visit 4 - Day 15
0.9 fold change
Interval 0.7 to 1.1
1.4 fold change
Interval 0.8 to 2.5
1.1 fold change
Interval 0.6 to 2.2
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Seropositive Participants
Visit 5 - Day 29
0.8 fold change
Interval 0.6 to 1.1
1.9 fold change
Interval 1.4 to 2.7
1.2 fold change
Interval 0.9 to 1.8
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Seropositive Participants
Visit 6 - Day 85
0.8 fold change
Interval 0.6 to 1.2
1.9 fold change
Interval 1.4 to 2.6
1.4 fold change
Interval 0.9 to 2.2
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Seropositive Participants
Visit 7 - Day 180
1.2 fold change
Interval 0.8 to 1.8
1.1 fold change
Interval 0.7 to 1.6
1.2 fold change
Interval 0.6 to 2.1
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline in Seropositive Participants
Visit 8 - Day 365
0.9 fold change
Interval 0.6 to 1.3
1.2 fold change
Interval 0.6 to 2.4
1.4 fold change
Interval 0.8 to 2.2

SECONDARY outcome

Timeframe: at Days 15, 29, 85, 180 and at Month 12 post-vaccination

Population: Per Protocol Population

Fold Change for CHIKV-Specific Neutralizing Antibody Titers by Visit by Age Group and Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=29 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=36 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=13 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=39 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=38 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Age Stratum
Visit 4 - Day 15
83.6 fold change
Interval 44.3 to 157.7
221.4 fold change
Interval 171.6 to 285.7
0.9 fold change
Interval 0.8 to 1.1
140.0 fold change
Interval 80.9 to 242.2
227.5 fold change
Interval 151.8 to 341.0
1.0 fold change
Interval 1.0 to 1.0
96.0 fold change
Interval 46.3 to 199.3
147.5 fold change
Interval 80.9 to 268.9
1.0 fold change
Interval 0.9 to 1.2
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Age Stratum
Visit 5 - Day 29
197.9 fold change
Interval 94.2 to 415.8
344.4 fold change
Interval 295.7 to 401.0
0.9 fold change
Interval 0.8 to 1.1
211.5 fold change
Interval 126.3 to 354.2
313.5 fold change
Interval 210.8 to 466.1
1.0 fold change
Interval 1.0 to 1.0
143.9 fold change
Interval 73.0 to 283.7
216.2 fold change
Interval 123.5 to 378.4
1.1 fold change
Interval 0.9 to 1.2
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Age Stratum
Visit 6 - Day 85
63.4 fold change
Interval 34.8 to 115.8
124.1 fold change
Interval 100.4 to 153.4
0.9 fold change
Interval 0.8 to 1.1
74.2 fold change
Interval 48.3 to 114.2
107.4 fold change
Interval 76.4 to 150.9
1.0 fold change
Interval 1.0 to 1.0
51.7 fold change
Interval 27.8 to 96.4
83.1 fold change
Interval 50.0 to 138.1
1.0 fold change
Interval 0.9 to 1.2
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Age Stratum
Visit 7 - Day 180
57.4 fold change
Interval 31.6 to 104.2
83.5 fold change
Interval 64.8 to 107.7
0.9 fold change
Interval 0.8 to 1.1
45.6 fold change
Interval 30.4 to 68.4
87.2 fold change
Interval 63.5 to 119.8
1.0 fold change
Interval 1.0 to 1.0
50.6 fold change
Interval 27.2 to 94.0
82.0 fold change
Interval 51.8 to 129.9
1.0 fold change
Interval 0.9 to 1.0
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Age Stratum
Visit 8 - Day 365
69.3 fold change
Interval 37.6 to 127.7
145.1 fold change
Interval 110.2 to 191.0
1.0 fold change
Interval 0.8 to 1.2
83.7 fold change
Interval 50.8 to 137.9
138.2 fold change
Interval 97.5 to 195.9
1.0 fold change
Interval 1.0 to 1.0
81.4 fold change
Interval 40.0 to 165.5
124.3 fold change
Interval 70.3 to 219.6
1.0 fold change
Interval 0.9 to 1.2

SECONDARY outcome

Timeframe: at Days 15, 29, 85, 180 and at Month 12 post-vaccination

Population: Per Protocol Population

Fold Change for CHIKV-Specific Neutralizing Antibody Titers by Visit Pooled by Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=107 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=115 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Dose
Visit 4 - Day 15
106.3 fold change
Interval 74.0 to 152.7
194.5 fold change
Interval 150.6 to 251.1
1.0 fold change
Interval 0.9 to 1.1
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Dose
Visit 5 - Day 29
181.2 fold change
Interval 126.7 to 259.1
284.4 fold change
Interval 224.7 to 359.9
1.0 fold change
Interval 0.9 to 1.1
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Dose
Visit 6 - Day 85
62.5 fold change
Interval 45.9 to 85.2
102.6 fold change
Interval 82.5 to 127.6
1.0 fold change
Interval 0.9 to 1.0
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Dose
Visit 7 - Day 180
50.4 fold change
Interval 37.3 to 68.0
84.3 fold change
Interval 68.9 to 103.0
1.0 fold change
Interval 0.9 to 1.0
Fold Change of CHIKV-specific Neutralizing Antibody Titers as Compared to Baseline Stratified by Dose
Visit 8 - Day 365
78.7 fold change
Interval 56.0 to 110.4
135.3 fold change
Interval 106.7 to 171.6
1.0 fold change
Interval 0.9 to 1.1

SECONDARY outcome

Timeframe: at Day 15, Day 29, Day 85, Day 180 and Month 12

Population: Immunogenicity Population -Seronegative at Baseline (μPRNT50 ≤ 40)

Percentage of Participants Reaching a 4-/8-/16-/64-Fold Change in Titers by Visit Pooled by Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=109 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=116 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 4 - Day 15: 4-fold change
95 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 4 - Day 15: 8-fold change
95 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 4 - Day 15: 16-fold change
94 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 4 - Day 15: 64-fold change
83 Participants
103 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 5 - Day 29: 4-fold change
98 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 5 - Day 29: 8-fold change
97 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 5 - Day 29: 16-fold change
97 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 5 - Day 29: 64-fold change
95 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 6 - Day 85: 4-fold change
94 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 6 - Day 85: 8-fold change
94 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 6 - Day 85: 16-fold change
92 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 6 - Day 85: 64-fold change
74 Participants
93 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 7 - Day 180: 4-fold change
96 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 7 - Day 180: 8-fold change
95 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 7 - Day 180: 16-fold change
94 Participants
111 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 7 - Day 180: 64-fold change
59 Participants
85 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 8 - Day 365: 4-fold change
95 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 8 - Day 365: 8-fold change
94 Participants
110 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 8 - Day 365: 16-fold change
91 Participants
109 Participants
0 Participants
Percentage of Participants Seronegative at Baseline Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline
Visit 8 - Day 365: 64-fold change
74 Participants
100 Participants
0 Participants

SECONDARY outcome

Timeframe: at Day 15, Day 29, Day 85, Day 180 and Month 12

Population: Per Protocol Population

Percentage of Participants Reaching a 4-/8-/16-/64-Fold Change in Titers by Visit by Age Group and Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=29 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=36 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=13 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=39 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=38 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=40 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 4 - Day 15: 4-fold change
26 Participants
36 Participants
0 Participants
36 Participants
38 Participants
0 Participants
31 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 4 - Day 15: 8-fold change
26 Participants
36 Participants
0 Participants
36 Participants
38 Participants
0 Participants
31 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 4 - Day 15: 16-fold change
26 Participants
36 Participants
0 Participants
36 Participants
38 Participants
0 Participants
30 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 4 - Day 15: 64-fold change
22 Participants
34 Participants
0 Participants
32 Participants
35 Participants
0 Participants
28 Participants
33 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 5 - Day 29: 4-fold change
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
33 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 5 - Day 29: 8-fold change
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
32 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 5 - Day 29: 16-fold change
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
32 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 5 - Day 29: 64-fold change
25 Participants
36 Participants
0 Participants
36 Participants
38 Participants
0 Participants
32 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 6 - Day 85: 4-fold change
26 Participants
35 Participants
0 Participants
35 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 6 - Day 85: 8-fold change
26 Participants
35 Participants
0 Participants
34 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 6 - Day 85: 16-fold change
26 Participants
35 Participants
0 Participants
34 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 6 - Day 85: 64-fold change
22 Participants
30 Participants
0 Participants
26 Participants
31 Participants
0 Participants
24 Participants
31 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 7 - Day 180: 4-fold change
26 Participants
36 Participants
0 Participants
38 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 7 - Day 180: 8-fold change
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 7 - Day 180: 16-fold change
26 Participants
36 Participants
0 Participants
36 Participants
38 Participants
0 Participants
30 Participants
36 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 7 - Day 180: 64-fold change
19 Participants
25 Participants
0 Participants
18 Participants
28 Participants
0 Participants
21 Participants
31 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 8 - Day 365: 4-fold change
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
30 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 8 - Day 365: 8-fold change
26 Participants
36 Participants
0 Participants
37 Participants
38 Participants
0 Participants
29 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 8 - Day 365: 16-fold change
26 Participants
35 Participants
0 Participants
35 Participants
38 Participants
0 Participants
28 Participants
35 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline Stratified by Age Stratum
Visit 8 - Day 365: 64-fold change
21 Participants
32 Participants
0 Participants
25 Participants
33 Participants
0 Participants
26 Participants
34 Participants
0 Participants

SECONDARY outcome

Timeframe: at Day 15, Day 29, Day 85, Day 180 and Month 12

Population: Per Protocol Population

Percentage of Participants Reaching a 4-/8-/16-/64-Fold Change in Titers by Visit Pooled by Trial Arm.

Outcome measures

Outcome measures
Measure
VLA1553 Half Dose - 7-11 Years
n=107 Participants
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=115 Participants
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=53 Participants
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 8 - Day 365: 16-fold change
89 Participants
108 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 4 - Day 15: 4-fold change
93 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 4 - Day 15: 8-fold change
93 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 4 - Day 15: 16-fold change
92 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 4 - Day 15: 64-fold change
82 Participants
102 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 5 - Day 29: 4-fold change
96 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 5 - Day 29: 8-fold change
95 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 5 - Day 29: 16-fold change
95 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 5 - Day 29: 64-fold change
93 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 6 - Day 85: 4-fold change
91 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 6 - Day 85: 8-fold change
91 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 6 - Day 85: 16-fold change
90 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 6 - Day 85: 64-fold change
72 Participants
92 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 7 - Day 180: 4-fold change
94 Participants
110 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 7 - Day 180: 8-fold change
93 Participants
110 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 7 - Day 180: 16-fold change
92 Participants
110 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 7 - Day 180: 64-fold change
58 Participants
84 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 8 - Day 365: 4-fold change
93 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 8 - Day 365: 8-fold change
92 Participants
109 Participants
0 Participants
Percentage of Participants Reaching an at Least 4-fold, 8-fold, 16-fold or 64-fold Change in CHIKV-specific Neutralizing Antibody Titers Compared to Baseline by Dose
Visit 8 - Day 365: 64-fold change
72 Participants
99 Participants
0 Participants

Adverse Events

VLA1553 Half Dose - 7-11 Years

Serious events: 1 serious events
Other events: 27 other events
Deaths: 0 deaths

VLA1553 Full Dose - 7-11 Years

Serious events: 2 serious events
Other events: 32 other events
Deaths: 0 deaths

Control - 7-11 Years

Serious events: 0 serious events
Other events: 15 other events
Deaths: 0 deaths

VLA1553 Half Dose - 3-6 Years

Serious events: 1 serious events
Other events: 29 other events
Deaths: 0 deaths

VLA1553 Full Dose - 3-6 Years

Serious events: 0 serious events
Other events: 24 other events
Deaths: 0 deaths

Control - 3-6 Years

Serious events: 0 serious events
Other events: 16 other events
Deaths: 0 deaths

VLA1553 Half Dose - 1-2 Years

Serious events: 0 serious events
Other events: 28 other events
Deaths: 0 deaths

VLA1553 Full Dose - 1-2 Years

Serious events: 2 serious events
Other events: 32 other events
Deaths: 0 deaths

Control - 1-2 Years

Serious events: 1 serious events
Other events: 14 other events
Deaths: 0 deaths

Serious adverse events

Serious adverse events
Measure
VLA1553 Half Dose - 7-11 Years
n=40 participants at risk
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 participants at risk
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 participants at risk
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 participants at risk
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 participants at risk
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 participants at risk
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 participants at risk
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 participants at risk
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 participants at risk
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
Infections and infestations
Cellulitis
2.5%
1/40 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/43 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/21 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/39 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/41 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Infections and infestations
Appendicitis perforated
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/43 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/21 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
2.5%
1/40 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/39 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/41 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Infections and infestations
Pneumonia
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/43 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/21 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/39 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/41 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.0%
1/20 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Respiratory, thoracic and mediastinal disorders
Asthmatic crisis
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
2.3%
1/43 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/21 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/39 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
2.4%
1/41 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Gastrointestinal disorders
Faecaloma
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
2.3%
1/43 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/21 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/39 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/41 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Immune system disorders
Drug hypersensitivity
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/43 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/21 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/39 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
2.4%
1/41 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI

Other adverse events

Other adverse events
Measure
VLA1553 Half Dose - 7-11 Years
n=40 participants at risk
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 7-11 Years
n=43 participants at risk
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 7-11 Years
n=21 participants at risk
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 3-6 Years
n=40 participants at risk
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 3-6 Years
n=40 participants at risk
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 3-6 Years
n=20 participants at risk
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
VLA1553 Half Dose - 1-2 Years
n=39 participants at risk
VLA1553 Half dose formulation (target 3.7 log 10 TCID50 per 0.5 mL)
VLA1553 Full Dose - 1-2 Years
n=41 participants at risk
VLA1553 Full dose formulation (target 4.0 log 10 TCID50 per 0.5 mL)
Control - 1-2 Years
n=20 participants at risk
Single intramuscular vaccination on Day 1 with Nimenrix (Men ACWY vaccine), a conjugate vaccine indicated for the active immunization
General disorders
Pyrexia
17.5%
7/40 • Number of events 8 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
14.0%
6/43 • Number of events 6 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
4.8%
1/21 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
20.0%
8/40 • Number of events 9 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
15.0%
6/40 • Number of events 6 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
20.0%
4/20 • Number of events 4 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
23.1%
9/39 • Number of events 9 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
17.1%
7/41 • Number of events 8 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.0%
1/20 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Infections and infestations
Nasopharyngitis
42.5%
17/40 • Number of events 27 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
41.9%
18/43 • Number of events 29 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
28.6%
6/21 • Number of events 10 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
47.5%
19/40 • Number of events 28 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
35.0%
14/40 • Number of events 29 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
50.0%
10/20 • Number of events 17 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
61.5%
24/39 • Number of events 48 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
65.9%
27/41 • Number of events 68 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
55.0%
11/20 • Number of events 25 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Infections and infestations
Viral infection
0.00%
0/40 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
2.3%
1/43 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
23.8%
5/21 • Number of events 7 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
7.5%
3/40 • Number of events 5 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
7.5%
3/40 • Number of events 4 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
15.0%
3/20 • Number of events 3 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
7.7%
3/39 • Number of events 5 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
9.8%
4/41 • Number of events 4 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.0%
1/20 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
General disorders
Injection site pain
30.0%
12/40 • Number of events 18 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
18.6%
8/43 • Number of events 11 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
28.6%
6/21 • Number of events 10 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
12.5%
5/40 • Number of events 6 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
17.5%
7/40 • Number of events 10 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.1%
2/39 • Number of events 2 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
2.4%
1/41 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.0%
1/20 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Gastrointestinal disorders
Diarrhoea
2.5%
1/40 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
7.0%
3/43 • Number of events 3 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/21 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.0%
2/40 • Number of events 2 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
2.5%
1/40 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
10.0%
2/20 • Number of events 2 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
7.7%
3/39 • Number of events 3 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
17.1%
7/41 • Number of events 11 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
25.0%
5/20 • Number of events 7 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Gastrointestinal disorders
Vomiting
2.5%
1/40 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
7.0%
3/43 • Number of events 4 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/21 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
10.0%
4/40 • Number of events 4 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
10.0%
4/40 • Number of events 4 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
10.0%
2/20 • Number of events 2 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
7.7%
3/39 • Number of events 3 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
12.2%
5/41 • Number of events 5 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.0%
1/20 • Number of events 2 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Nervous system disorders
Headache
35.0%
14/40 • Number of events 18 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
34.9%
15/43 • Number of events 17 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
23.8%
5/21 • Number of events 6 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
12.5%
5/40 • Number of events 5 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
17.5%
7/40 • Number of events 7 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
15.0%
3/20 • Number of events 3 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/39 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/41 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
0.00%
0/20 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
Respiratory, thoracic and mediastinal disorders
Rhinitis allergic
10.0%
4/40 • Number of events 4 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
7.0%
3/43 • Number of events 4 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
4.8%
1/21 • Number of events 1 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.0%
2/40 • Number of events 5 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
5.0%
2/40 • Number of events 3 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
15.0%
3/20 • Number of events 5 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
12.8%
5/39 • Number of events 5 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
19.5%
8/41 • Number of events 8 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI
20.0%
4/20 • Number of events 7 • - Up to 14 days post-vaccination: solicited local and systemic Adverse Events - Up to Month 6 and Month 12 post-vaccination: Unsolicited AEs - Up to Month 6 and Month 12 post-vaccination: SAEs - Within 2 to 21 days post-vaccination: early onset AESI - 22 days post-vaccination till trial end: late onset AESI

Additional Information

Clinical Strategy Manager

Valneva Austria GmbH

Phone: +43 1 206 20

Results disclosure agreements

  • Principal investigator is a sponsor employee
  • Publication restrictions are in place