Trial Outcomes & Findings for Evaluation of Full Versus Fractional Dose of COVID-19 Vaccine Given as a Booster for the Prevention of COVID-19 in Adults in Mongolia. (NCT NCT05265065)

NCT ID: NCT05265065

Last Updated: 2026-03-24

Results Overview

Serum samples collected at 28-days post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific IgG antibodies using IgG ELISA. The primary endpoint is the seroresponse rate at the Day-28 visit. The seroresponse rate at the individual level is defined as either a ≥4-fold rise in binding antibodies at the Day-28 visit compared to baseline (pre-vaccination) with a titre of \<200 BAU/ml, a ≥2-fold rise among participants with a baseline (pre-vaccination) titre of \>200 BAU/ml, or a ≥4-times the lower limit of detection if baseline levels are lower than the limit of detection.

Recruitment status

COMPLETED

Study phase

PHASE3

Target enrollment

601 participants

Primary outcome timeframe

28-days post booster vaccination

Results posted on

2026-03-24

Participant Flow

There are two study arms (i.e. groups to which participants were randomised), as per "Arms and Interventions" in Protocol Section, corresponding to the primary analysis comparing a full dose to a fractional dose. Stratified randomisation was performed to ensure balanced randomisation according to the primary vaccine received (prior to this study) and age for secondary subgroup analyses. The Participant Flow was edited to reflect the randomisation of participants into two arms.

Participant milestones

Participant milestones
Measure
Standard
30µg Pfizer-BioNTech booster dose
Fractional
15µg Pfizer-BioNTech booster dose
Overall Study
STARTED
300
301
Overall Study
Received allocated d dose
299
299
Overall Study
Included in Day 28 immunogenicity analysis
292
295
Overall Study
COMPLETED
282
285
Overall Study
NOT COMPLETED
18
16

Reasons for withdrawal

Withdrawal data not reported

Baseline Characteristics

Race and Ethnicity were not collected from any participant.

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure
AstraZeneca (ChAdOx1-S, or Vaxzevria®) - Standard Pfizer-BioNTech Booster Group
n=65 Participants
Previously received two doses of AstraZeneca as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
AstraZeneca (ChAdOx1-S, or Vaxzevria®) - Fractional Pfizer-BioNTech Booster Group
n=65 Participants
Previously received two doses of AstraZeneca as primary COVID-19 vaccine . Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
n=201 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
n=200 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
n=34 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
n=36 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Total
n=601 Participants
Total of all reporting groups
Age, Categorical
<=18 years
0 Participants
n=65 Participants
0 Participants
n=65 Participants
3 Participants
n=201 Participants
0 Participants
n=200 Participants
0 Participants
n=34 Participants
0 Participants
n=36 Participants
3 Participants
n=601 Participants
Age, Categorical
Between 18 and 65 years
65 Participants
n=65 Participants
65 Participants
n=65 Participants
189 Participants
n=201 Participants
186 Participants
n=200 Participants
30 Participants
n=34 Participants
35 Participants
n=36 Participants
570 Participants
n=601 Participants
Age, Categorical
>=65 years
0 Participants
n=65 Participants
0 Participants
n=65 Participants
9 Participants
n=201 Participants
14 Participants
n=200 Participants
4 Participants
n=34 Participants
1 Participants
n=36 Participants
28 Participants
n=601 Participants
Age, Continuous
34.5 years
n=65 Participants
40.2 years
n=65 Participants
47.8 years
n=201 Participants
48.8 years
n=200 Participants
43.1 years
n=34 Participants
41.3 years
n=36 Participants
44 years
n=601 Participants
Sex: Female, Male
Female
33 Participants
n=65 Participants
32 Participants
n=65 Participants
115 Participants
n=201 Participants
114 Participants
n=200 Participants
19 Participants
n=34 Participants
14 Participants
n=36 Participants
327 Participants
n=601 Participants
Sex: Female, Male
Male
32 Participants
n=65 Participants
33 Participants
n=65 Participants
86 Participants
n=201 Participants
86 Participants
n=200 Participants
15 Participants
n=34 Participants
22 Participants
n=36 Participants
274 Participants
n=601 Participants
Race and Ethnicity Not Collected
0 Participants
Race and Ethnicity were not collected from any participant.
Region of Enrollment
Mongolia
65 participants
n=65 Participants
65 participants
n=65 Participants
201 participants
n=201 Participants
200 participants
n=200 Participants
34 participants
n=34 Participants
36 participants
n=36 Participants
601 participants
n=601 Participants
BMI
26.3 kg/m2
n=65 Participants
25.4 kg/m2
n=65 Participants
24.6 kg/m2
n=201 Participants
24.8 kg/m2
n=200 Participants
25.3 kg/m2
n=34 Participants
25.8 kg/m2
n=36 Participants
25.2 kg/m2
n=601 Participants

PRIMARY outcome

Timeframe: 28-days post booster vaccination

Population: The analysis of immunogenicity endpoints included all participants with outcome data. There are two study arms, as per "Arms and Interventions" in Protocol Section, corresponding to the primary analysis comparing a full dose to a fractional dose. Stratified randomisation was performed to ensure balanced randomisation according to the primary vaccine received (prior to this study) and age for secondary subgroup analyses. The primary outcome is unstratified.

Serum samples collected at 28-days post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific IgG antibodies using IgG ELISA. The primary endpoint is the seroresponse rate at the Day-28 visit. The seroresponse rate at the individual level is defined as either a ≥4-fold rise in binding antibodies at the Day-28 visit compared to baseline (pre-vaccination) with a titre of \<200 BAU/ml, a ≥2-fold rise among participants with a baseline (pre-vaccination) titre of \>200 BAU/ml, or a ≥4-times the lower limit of detection if baseline levels are lower than the limit of detection.

Outcome measures

Outcome measures
Measure
Standard
n=292 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=295 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Seroresponse
253 Participants
250 Participants

PRIMARY outcome

Timeframe: 7 days post booster vaccination

Population: The reactogenicity and safety analysis populations included all randomised participants who received a study vaccine, according to the vaccine received. There are two study arms, as per "Arms and Interventions" in Protocol Section. Stratified randomisation was performed to ensure balanced randomisation according to the primary vaccine received (prior to this study) and age for secondary subgroup analyses. The primary outcome is unstratified.

Questionnaire to document solicited reactions is developed specifically for this study. Data will be reported as the proportion of participants who report grade 3 or 4 reactions by each intervention arm. Solicited reactions such as pain, tenderness, erythema/redness, induration, swelling, fever, nausea, vomiting, headache, fatigue/malaise, myalgia, arthralgia, diarrhea, enlarged lymph nodes will be collected from the participants 7 days post-vaccination.

Outcome measures

Outcome measures
Measure
Standard
n=299 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=299 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Solicited Grade 3 or 4 Local or Systemic Reaction
6 Participants
4 Participants

SECONDARY outcome

Timeframe: 28-days post booster vaccination

Population: The analysis of immunogenicity endpoints included all participants with outcome data

Serum samples collected at 28-days post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific IgG antibodies using IgG ELISA. The primary endpoint is the seroresponse rate at the Day-28 visit. The seroresponse rate at the individual level is defined as either a ≥4-fold rise in binding antibodies at the Day-28 visit compared to baseline (pre-vaccination) with a titre of \<200 BAU/ml, a ≥2-fold rise among participants with a baseline (pre-vaccination) titre of \>200 BAU/ml, or a ≥4-times the lower limit of detection if baseline levels are lower than the limit of detection. Priming strata (previously COVID vaccination): AstraZeneca (ChAdOx1-S, or Vaxzevria®); Sinopharm (BBIBP-CorV®); Sputnik V (Gam-COVID-Vac®)

Outcome measures

Outcome measures
Measure
Standard
n=65 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=62 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
n=194 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
n=198 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
n=33 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
n=35 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Seroresponse by Priming Vaccine Strata
55 Participants
52 Participants
170 Participants
169 Participants
28 Participants
29 Participants

SECONDARY outcome

Timeframe: 28-days post booster vaccination

Population: The analysis of immunogenicity endpoints included all participants with outcome data.

Serum samples collected at 28-days post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific IgG antibodies using IgG ELISA.

Outcome measures

Outcome measures
Measure
Standard
n=292 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=295 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
SARS-CoV-2 Specific IgG Antibodies at Day-28
4946 BAU/ml
Interval 4614.0 to 5302.0
4619 BAU/ml
Interval 4292.0 to 4970.0

SECONDARY outcome

Timeframe: 28-days post booster vaccination

Population: The analysis of immunogenicity endpoints included all participants with outcome data

Serum samples collected at 28-days post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific IgG antibodies using IgG ELISA. Priming strata (previously COVID vaccination): AstraZeneca (ChAdOx1-S, or Vaxzevria®); Sinopharm (BBIBP-CorV®); Sputnik V (Gam-COVID-Vac®)

Outcome measures

Outcome measures
Measure
Standard
n=65 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=62 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
n=194 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
n=198 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
n=33 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
n=35 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
SARS-CoV-2 Specific IgG Antibodies at Day-28 by Priming Vaccine Strata
4394 BAU/ml
Interval 3863.0 to 4997.0
4167 BAU/ml
Interval 3550.0 to 4892.0
5109 BAU/ml
Interval 4678.0 to 5580.0
4970 BAU/ml
Interval 4541.0 to 5438.0
5160 BAU/ml
Interval 4128.0 to 6450.0
3662 BAU/ml
Interval 3016.0 to 4447.0

SECONDARY outcome

Timeframe: Baseline (pre booster), 28 days, 6 months, 12 months, 18 months, and 24 months post-booster vaccination.

Population: Standard arm: baseline 1 withdrawn; day 28: 6 missed, 1 withdrawn; 6 months: 9 missed, 4 withdrawn, 1 lost to follow up (LTFU); 12 months: 5 missed, 3 withdrawn; 18 months: 8 missed, 17 withdrawn, 1 LTFU; 24 months: 5 withdrawn, 7 LTFU. Fractional arm: baseline 1 withdrawn; day 28: 4 missed, 1 withdrawn; 6 months: 6 missed, 3 withdrawn, 1 sample not taken; 12 months: 3 missed, 5 withdrawn, 1 LTFU; 18 months: 9 missed, 12 withdrawn, 4 LTFU; 24 months: 6 withdrawn, 8 LTFU.

Serum samples collected at baseline (pre booster), 28 days, 6 months, 12 months, 18 months, and 24 months post booster vaccination from the study arms will be evaluated for SARS-CoV-2 specific IgG antibodies using the commercial Euroimmun S1 IgG ELISA. Data will be reported as binding antibody units (BAU)/mL and presented as geometric mean concentration (GMC) and 95% confidence intervals (CI).

Outcome measures

Outcome measures
Measure
Standard
n=299 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=300 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
SARS-CoV-2 Specific IgG Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination.
Baseline anti-spike IgG GMC (95% CI)
969 binding antibody units (BAU/mL)
Interval 876.0 to 1072.0
929 binding antibody units (BAU/mL)
Interval 839.0 to 1029.0
SARS-CoV-2 Specific IgG Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination.
28 days anti-spike IgG GMC (95% CI)
4946 binding antibody units (BAU/mL)
Interval 4614.0 to 5302.0
4619 binding antibody units (BAU/mL)
Interval 4292.0 to 4970.0
SARS-CoV-2 Specific IgG Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination.
6 months anti-spike IgG GMC (95% CI)
2085 binding antibody units (BAU/mL)
Interval 1926.0 to 2256.0
2123 binding antibody units (BAU/mL)
Interval 1964.0 to 2296.0
SARS-CoV-2 Specific IgG Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination.
12 months anti-spike IgG GMC (95% CI)
2204 binding antibody units (BAU/mL)
Interval 2030.0 to 2393.0
2208 binding antibody units (BAU/mL)
Interval 2027.0 to 2404.0
SARS-CoV-2 Specific IgG Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination.
18 months anti-spike IgG GMC (95% CI)
1336 binding antibody units (BAU/mL)
Interval 1231.0 to 1450.0
1425 binding antibody units (BAU/mL)
Interval 1313.0 to 1546.0
SARS-CoV-2 Specific IgG Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination.
24 months anti-spike IgG GMC (95% CI)
1051 binding antibody units (BAU/mL)
Interval 973.0 to 1135.0
1107 binding antibody units (BAU/mL)
Interval 1021.0 to 1199.0

SECONDARY outcome

Timeframe: Baseline (pre-booster), 28 days, 6 months, 12 months, 18 months, and 24 months post-booster vaccination.

Population: Participant numbers vary because some missed visits or withdrew. One baseline sample was not collected. Follow-up blood collection was 98% at Day 28, 96% at 6 months, 95% at 12 months, 88% at 18 months, and 87% at 24 months. By 24 months, 59 withdrew for relocation, voluntary withdrawal, death, or investigator decision, and 22 were lost to follow-up.

Serum samples collected at baseline (pre booster), 28 days-, 6- and 12-months post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific neutralising antibodies using the GenScript® cPass surrogate virus neutralization test (sVNT) for both wild-type and Omicron variant. Neutralising antibody response will be reported as percentage (%) inhibition of receptor binding domain-angiotensin-converting enzyme 2 (RBD-ACE2) binding relative to a positive control.

Outcome measures

Outcome measures
Measure
Standard
n=299 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=300 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
Baseline Wuhan-Hu-1 SARS-CoV-2 sVNT inhibition
81 percentage (%) inhibition
Interval 76.0 to 85.0
81 percentage (%) inhibition
Interval 77.0 to 84.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
28 days Wuhan-Hu-1 SARS-CoV-2 sVNT inhibition
81 percentage (%) inhibition
Interval 78.0 to 84.0
81 percentage (%) inhibition
Interval 78.0 to 84.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
6 months Wuhan-Hu-1 SARS-CoV-2 sVNT inhibition
89 percentage (%) inhibition
Interval 88.0 to 91.0
89 percentage (%) inhibition
Interval 88.0 to 91.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
12 months Wuhan-Hu-1 SARS-CoV-2 sVNT inhibition
89 percentage (%) inhibition
Interval 88.0 to 90.0
89 percentage (%) inhibition
Interval 87.0 to 90.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
18 months Wuhan-Hu-1 SARS-CoV-2 sVNT inhibition
88 percentage (%) inhibition
Interval 87.0 to 90.0
88 percentage (%) inhibition
Interval 86.0 to 90.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
24 months Wuhan-Hu-1 SARS-CoV-2 sVNT inhibition
88 percentage (%) inhibition
Interval 86.0 to 89.0
88 percentage (%) inhibition
Interval 86.0 to 90.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
Baseline Omicron BA.1 SARS-CoV-2 sVNT inhibition
52 percentage (%) inhibition
Interval 17.0 to 77.0
51 percentage (%) inhibition
Interval 18.0 to 76.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
28 days Omicron BA.1 SARS-CoV-2 sVNT inhibition
82 percentage (%) inhibition
Interval 75.0 to 85.0
81 percentage (%) inhibition
Interval 75.0 to 84.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
6 months Omicron BA.1 SARS-CoV-2 sVNT inhibition
74 percentage (%) inhibition
Interval 46.0 to 87.0
77 percentage (%) inhibition
Interval 48.0 to 87.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
12 months Omicron BA.1 SARS-CoV-2 sVNT inhibition
76 percentage (%) inhibition
Interval 44.0 to 87.0
79 percentage (%) inhibition
Interval 40.0 to 87.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
18 months Omicron BA.1 SARS-CoV-2 sVNT inhibition
81 percentage (%) inhibition
Interval 61.0 to 86.0
81 percentage (%) inhibition
Interval 64.0 to 86.0
SARS-CoV-2 Specific Neutralising Antibodies at Baseline (Pre-booster), 28 Days, 6 Months, 12 Months, 18 Months, and 24 Months Post-booster Vaccination Measured by Surrogate Virus Neutralisation Test (sVNT).
24 months Omicron BA.1 SARS-CoV-2 sVNT inhibition
84 percentage (%) inhibition
Interval 71.0 to 88.0
85 percentage (%) inhibition
Interval 70.0 to 88.0

SECONDARY outcome

Timeframe: Baseline (pre booster), 28 days-, 6- and 12-months post booster vaccination

A subset of samples (20%) from all four timepoints will be assessed using a SARS-CoV-2 microneutralisation assay to both the wild type (vaccine) strain and for two SARS-CoV-2 Variants of concern. Neutralizing antibody will be reported as endpoint titre.

Outcome measures

Outcome data not reported

SECONDARY outcome

Timeframe: Baseline (pre booster), 28 days, 6-, 12 -, 18-, and 24-months post booster vaccination

Population: Participant numbers differ because only 256 enrolled in the CMI substudy, with equal allocation by arm. Evaluable IGRA samples varied by visit due to missed visits or unavailable specimens. Sample completeness ranged from \~93-95% early to \~86% at 24 months. Thus, each row reflects only participants with valid samples at that time point, not the full substudy cohort.

IFN-γ concentrations (IU/mL) as a measure of cellular immunity will be assessed in a subset of participants. IFN-γ production will be stimulated using QuantiFERON Human IFN-γ SARS-CoV-2 (Qiagen) and quantified by ELISA. Results are summarised as geometric mean concentrations (GMCs) with 95% confidence intervals.

Outcome measures

Outcome measures
Measure
Standard
n=128 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=128 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
6 month IFN-γ Ag1
0.27 IU/mL
Interval 0.21 to 0.34
0.33 IU/mL
Interval 0.26 to 0.42
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
12 month IFN-γ Ag1
0.28 IU/mL
Interval 0.22 to 0.36
0.30 IU/mL
Interval 0.23 to 0.39
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
Baseline IFN-γ Ag1
0.26 IU/mL
Interval 0.2 to 0.34
0.31 IU/mL
Interval 0.23 to 0.41
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
28 day IFN-γ Ag1
0.46 IU/mL
Interval 0.37 to 0.58
0.60 IU/mL
Interval 0.47 to 0.77
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
18 month IFN-γ Ag1
0.21 IU/mL
Interval 0.15 to 0.28
0.28 IU/mL
Interval 0.21 to 0.37
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
24 month IFN-γ Ag1
0.27 IU/mL
Interval 0.2 to 0.37
0.35 IU/mL
Interval 0.28 to 0.46
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
Baseline IFN-γ Ag2
0.32 IU/mL
Interval 0.24 to 0.41
0.38 IU/mL
Interval 0.3 to 0.49
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
28 day IFN-γ Ag2
0.64 IU/mL
Interval 0.51 to 0.79
0.75 IU/mL
Interval 0.6 to 0.94
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
6 month IFN-γ Ag2
0.34 IU/mL
Interval 0.27 to 0.42
0.42 IU/mL
Interval 0.33 to 0.54
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
12 month IFN-γ Ag2
0.44 IU/mL
Interval 0.34 to 0.57
0.59 IU/mL
Interval 0.47 to 0.73
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
18 month IFN-γ Ag2
0.42 IU/mL
Interval 0.32 to 0.55
0.49 IU/mL
Interval 0.38 to 0.64
Interferon Gamma (IFNγ) Concentrations in International Units (IU)/mL
24 month IFN-γ Ag2
0.34 IU/mL
Interval 0.26 to 0.45
0.42 IU/mL
Interval 0.33 to 0.54

SECONDARY outcome

Timeframe: Baseline (pre-booster), 28 days, 6 and 12 months post booster vaccination

Population: ELISpot analyses of wild-type SARS-CoV-2 spike-specific IFN-γ responses were conducted in a predefined subset of participants with additional blood collection. Approximately 40% of participants in each arm were included in this cellular immunity substudy. The numbers analysed at each time point reflect participants with available and valid ELISpot results and therefore differ from the total number of participants randomised to each arm.

Applicable to the subset participants with additional blood collection. IFNγ producing cells as a measurement of cellular immunity will be assessed on a subset of the participants (40%) from each group. IFN-γ Enzyme-Linked ImmunoSpot (Elispot) assay will be performed on isolated peripheral blood mononuclear cells (PBMCs). Data will be reported as number of IFNγ producing cells/million and presented using means and 95% CI.

Outcome measures

Outcome measures
Measure
Standard
n=96 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=96 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Number of IFNγ Producing Cells/Million PBMCs
6 months
88 IFN-γ SFU per 10⁶ cells
Interval 50.0 to 156.0
80 IFN-γ SFU per 10⁶ cells
Interval 43.0 to 147.0
Number of IFNγ Producing Cells/Million PBMCs
Baseline
43 IFN-γ SFU per 10⁶ cells
Interval 24.0 to 77.0
40 IFN-γ SFU per 10⁶ cells
Interval 21.0 to 75.0
Number of IFNγ Producing Cells/Million PBMCs
28 days
118 IFN-γ SFU per 10⁶ cells
Interval 77.0 to 181.0
127 IFN-γ SFU per 10⁶ cells
Interval 87.0 to 185.0
Number of IFNγ Producing Cells/Million PBMCs
12 months
86 IFN-γ SFU per 10⁶ cells
Interval 50.0 to 147.0
82 IFN-γ SFU per 10⁶ cells
Interval 48.0 to 141.0

SECONDARY outcome

Timeframe: Baseline (pre-booster), 28 days, 6 and 12 months post-booster vaccination

Population: ICS analyses were conducted in a predefined subset of participants (\~40%) who provided additional blood samples. The numbers analysed at each time point reflect participants with available and valid ICS results and therefore differ from the total number randomised.

Frequency of wild-type SARS-CoV-2 spike-specific cytokine-expressing T cells will be assessed in a subset of participants (\~40%) using intracellular cytokine staining (ICS) by flow cytometry on PBMC samples. Results are reported as the frequency (%) of cytokine-expressing CD4 and CD8 memory T cells, summarised as geometric mean concentrations (GMCs) with 95% confidence intervals.

Outcome measures

Outcome measures
Measure
Standard
n=96 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=96 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Frequency of Cytokine-expressing T Cells
Baseline
0.007 % of cytokine-expressing T cells
Interval 0.004 to 0.013
0.008 % of cytokine-expressing T cells
Interval 0.005 to 0.015
Frequency of Cytokine-expressing T Cells
28 days
0.014 % of cytokine-expressing T cells
Interval 0.008 to 0.026
0.015 % of cytokine-expressing T cells
Interval 0.008 to 0.027
Frequency of Cytokine-expressing T Cells
6 months
0.010 % of cytokine-expressing T cells
Interval 0.006 to 0.019
0.011 % of cytokine-expressing T cells
Interval 0.006 to 0.02
Frequency of Cytokine-expressing T Cells
12 months
0.019 % of cytokine-expressing T cells
Interval 0.011 to 0.033
0.010 % of cytokine-expressing T cells
Interval 0.006 to 0.019

SECONDARY outcome

Timeframe: Baseline (pre booster), 28 days-, 6 and 12 months post booster vaccination

Population: Multiplex cytokine analyses were conducted in a predefined subset of participants with additional blood collection. Approximately 40% of participants in each arm were included in this cellular immunity substudy. The numbers analysed at each time point reflect participants with available and valid multiplex cytokine assay results and therefore differ from the total number of participants randomised to each arm.

Wild-type SARS-CoV-2 spike-specific cytokine concentrations following PBMC stimulation will be assessed in a predefined subset of participants (approximately 40%) using multiplex cytokine assays. Cytokine concentrations will be reported in pg/mL and summarised as geometric mean concentrations (GMCs) with 95% confidence intervals. IFN-γ ELISpot, intracellular cytokine staining (flow cytometry), and multiplex cytokine assays will be performed on isolated peripheral blood mononuclear cells (PBMCs).

Outcome measures

Outcome measures
Measure
Standard
n=128 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=128 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Cellular Immunity: Multiplex Cytokine Assays - Reported as Cytokine Concentrations in pg/ml and Presented as GMC and 95% CI
Baseline
2.77 pg/mL
Interval 1.54 to 4.98
3.64 pg/mL
Interval 2.15 to 6.16
Cellular Immunity: Multiplex Cytokine Assays - Reported as Cytokine Concentrations in pg/ml and Presented as GMC and 95% CI
28 days
11.71 pg/mL
Interval 7.45 to 18.39
14.74 pg/mL
Interval 9.3 to 23.35
Cellular Immunity: Multiplex Cytokine Assays - Reported as Cytokine Concentrations in pg/ml and Presented as GMC and 95% CI
6 months
4.38 pg/mL
Interval 2.3 to 8.35
6.22 pg/mL
Interval 3.43 to 11.29
Cellular Immunity: Multiplex Cytokine Assays - Reported as Cytokine Concentrations in pg/ml and Presented as GMC and 95% CI
12 months
7.61 pg/mL
Interval 4.4 to 13.16
10.71 pg/mL
Interval 6.69 to 17.14

SECONDARY outcome

Timeframe: 28 days-post booster vaccination

Population: The reactogenicity and safety analysis populations included all randomised participants who received a study vaccine, according to the vaccine received

All unsolicited AE will be collected for 28 days post booster vaccination. Data will be presented as proportion of participants who report unsolicited AE.

Outcome measures

Outcome measures
Measure
Standard
n=65 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=64 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
n=200 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
n=199 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
n=34 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
n=36 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Incidence of Unsolicited Adverse Events (AE)
5 Participants
9 Participants
12 Participants
7 Participants
5 Participants
5 Participants

SECONDARY outcome

Timeframe: 3 months post booster vaccination

All participants with medically attended AE will be collected for 3 months post booster vaccination. Data will be presented as number of participants who report unsolicited AE.

Outcome measures

Outcome measures
Measure
Standard
n=300 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=301 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Incidence of Medically Attended Adverse Events
19 Participants
16 Participants

SECONDARY outcome

Timeframe: 24 months post-booster

SAE will be collected throughout the follow-up period of 24 months post booster vaccination. Data will be presented as a proportion of participants who report unsolicited SAE.

Outcome measures

Outcome measures
Measure
Standard
n=65 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=65 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
n=201 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
n=200 Participants
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
n=34 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
n=36 Participants
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Incidence of Serious Adverse Events (SAE)
6 Participants
6 Participants
17 Participants
17 Participants
4 Participants
3 Participants

SECONDARY outcome

Timeframe: Up to 24 months post booster vaccination

Confirmed SARS-CoV-2 infections will be documented throughout the follow-up period, by clinical severity.

Outcome measures

Outcome measures
Measure
Standard
n=300 Participants
30µg Pfizer-BioNTech booster dose
Fractional
n=301 Participants
15µg Pfizer-BioNTech booster dose
Sinopharm (BBIBP-CorV®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sinopharm (BBIBP-CorV®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Standard Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Sputnik V (Gam-COVID-Vac®)- Fractional Pfizer-BioNTech Booster Group
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Incidence of PCR Confirmed COVID-19 Infection
14 Participants
14 Participants

SECONDARY outcome

Timeframe: At 18 and 24 months post booster vaccination

Applicable to the subset participants with additional blood collection. IFNγ producing cells as a measurement of cellular immunity will be assessed on a subset of the participants (40%) from each group. IFN-γ Enzyme-Linked ImmunoSpot (Elispot) assay will be performed on isolated peripheral blood mononuclear cells (PBMCs). Data will be reported as number of IFNγ producing cells/million and presented using means and 95% CI.

Outcome measures

Outcome data not reported

SECONDARY outcome

Timeframe: 18 and 24 months post-booster vaccination

Frequency of wild-type SARS-CoV-2 spike-specific cytokine-expressing T cells will be assessed in a subset of participants (\~40%) using intracellular cytokine staining (ICS) by flow cytometry on PBMC samples. Results are reported as the frequency (%) of cytokine-expressing CD4 and CD8 memory T cells, summarised as geometric mean concentrations (GMCs) with 95% confidence intervals.

Outcome measures

Outcome data not reported

SECONDARY outcome

Timeframe: 18 and 24 months post booster vaccination

Wild-type SARS-CoV-2 spike-specific cytokine concentrations following PBMC stimulation will be assessed in a predefined subset of participants (approximately 40%) using multiplex cytokine assays. Cytokine concentrations will be reported in pg/mL and summarised as geometric mean concentrations (GMCs) with 95% confidence intervals. IFN-γ ELISpot, intracellular cytokine staining (flow cytometry), and multiplex cytokine assays will be performed on isolated peripheral blood mononuclear cells (PBMCs).

Outcome measures

Outcome data not reported

Adverse Events

Standard Pfizer-BioNTech Booster Group- AstraZeneca

Serious events: 0 serious events
Other events: 5 other events
Deaths: 0 deaths

Fractional Pfizer-BioNTech Booster Group- AstraZeneca

Serious events: 2 serious events
Other events: 7 other events
Deaths: 0 deaths

Standard Pfizer-BioNTech Booster Group- Sinopharm

Serious events: 2 serious events
Other events: 10 other events
Deaths: 0 deaths

Fractional Pfizer-BioNTech Booster Group- Sinopharm

Serious events: 0 serious events
Other events: 7 other events
Deaths: 0 deaths

Standard Pfizer-BioNTech Booster Group- Sputnik

Serious events: 1 serious events
Other events: 5 other events
Deaths: 0 deaths

Fractional Pfizer-BioNTech Booster Group- Sputnik

Serious events: 0 serious events
Other events: 5 other events
Deaths: 0 deaths

Serious adverse events

Serious adverse events
Measure
Standard Pfizer-BioNTech Booster Group- AstraZeneca
n=65 participants at risk
Previously received two doses of AstraZeneca as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Fractional Pfizer-BioNTech Booster Group- AstraZeneca
n=65 participants at risk
Previously received two doses of AstraZeneca as primary COVID-19 vaccine. Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Standard Pfizer-BioNTech Booster Group- Sinopharm
n=201 participants at risk
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Fractional Pfizer-BioNTech Booster Group- Sinopharm
n=200 participants at risk
Previously received two doses of Sinopharm as primary COVID-19 vaccine. Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Standard Pfizer-BioNTech Booster Group- Sputnik
n=34 participants at risk
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Fractional Pfizer-BioNTech Booster Group- Sputnik
n=36 participants at risk
Previously received two doses of Sputnik as primary COVID-19 vaccine. Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Hepatobiliary disorders
Hepatobiliary
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.9%
1/34 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Injury, poisoning and procedural complications
Lower limb fracture
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Metabolism and nutrition disorders
Diabetes mellitus
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Metabolism and nutrition disorders
Gout
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.

Other adverse events

Other adverse events
Measure
Standard Pfizer-BioNTech Booster Group- AstraZeneca
n=65 participants at risk
Previously received two doses of AstraZeneca as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Fractional Pfizer-BioNTech Booster Group- AstraZeneca
n=65 participants at risk
Previously received two doses of AstraZeneca as primary COVID-19 vaccine. Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Standard Pfizer-BioNTech Booster Group- Sinopharm
n=201 participants at risk
Previously received two doses of Sinopharm as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Fractional Pfizer-BioNTech Booster Group- Sinopharm
n=200 participants at risk
Previously received two doses of Sinopharm as primary COVID-19 vaccine. Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Standard Pfizer-BioNTech Booster Group- Sputnik
n=34 participants at risk
Previously received two doses of Sputnik as primary COVID-19 vaccine Tozinameran - Standard Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 30 µg in 0.3 ml. Liquid for injection. Single dose.
Fractional Pfizer-BioNTech Booster Group- Sputnik
n=36 participants at risk
Previously received two doses of Sputnik as primary COVID-19 vaccine. Tozinameran - Fractional Dose: Tozinameran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cellfree in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Dose - 15 µg in 0.15 ml. Liquid for injection. Single dose.
Gastrointestinal disorders
Abdominal cramps
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Infections and infestations
Acute respiratory tract infection
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.8%
1/36 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Infections and infestations
Acute upper respiratory tract infection
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.9%
1/34 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.8%
1/36 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Immune system disorders
Allergy to chemicals
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/200 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Blood and lymphatic system disorders
Anaemia
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Musculoskeletal and connective tissue disorders
Arthralgia
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/200 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Musculoskeletal and connective tissue disorders
Back pain
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
General disorders
Chest discomfort
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/200 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Respiratory, thoracic and mediastinal disorders
Dyspnoea
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Skin and subcutaneous tissue disorders
Eczema
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
General disorders
Fatigue
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Infections and infestations
Furuncle
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/200 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Nervous system disorders
Headache
3.1%
2/65 • Number of events 2 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.00%
2/201 • Number of events 2 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.0%
2/200 • Number of events 2 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.9%
1/34 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.8%
1/36 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Vascular disorders
Hypertension
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
5.9%
2/34 • Number of events 2 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.8%
1/36 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Reproductive system and breast disorders
Irregular menstruation
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/200 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Social circumstances
Natural menopause
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.9%
1/34 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Cardiac disorders
Palpitations
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
2.8%
1/36 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Infections and infestations
Tooth infection
0.00%
0/65 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/201 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
Infections and infestations
Upper respiratory tract infection
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
1.5%
1/65 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.50%
1/201 • Number of events 1 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/200 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/34 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.
0.00%
0/36 • Solicited local and systemic adverse events (AEs) were collected from the participants 7 days post-vaccination Unsolicited AEs up to 28 days following vaccination observed by the Investigator or reported by the participant, whether or not attributed to study medication, were also collected. Serious adverse events (SAE's) will be followed up for the duration of the trial up to 24 months.

Additional Information

Kim Mulholland

Murdoch Children's Research Institute

Phone: +61 3 99366656

Results disclosure agreements

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