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Safety, Tolerability, and Immunogenicity Study of Sm-p80 + GLA-SE (SchistoShield(R)) Vaccine in Healthy Adults

NCT05292391 · Status: COMPLETED · Phase: PHASE1 · Type: INTERVENTIONAL · Enrollment: 45

Last updated 2025-07-14

Study results available
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Summary

This is a Phase 1, open-label, dose-escalation clinical trial to evaluate the safety, reactogenicity, and immunogenicity of the Sm-p80+GLA-SE vaccine candidate in healthy adults between 18 and 55 years of age. Forty-five subjects will receive a series of three intramuscular injections 28 days apart with dose based on group. Five treatment groups, each including nine subjects, will receive three intramuscular (IM) injections of 0.5 mL of the designated study product on either Days 1, 29, and 57 or on Days 1, 29, and 180 (Table 1). Group A (unadjuvanted comparator) will receive 100 micrograms Sm-p80 alone on Days 1, 29, and 57, Group B (low dose standard schedule) will receive 10 micrograms Sm-p80 + 5 micrograms GLA-SE on Days 1, 29 and 57, Group C (mid dose delayed booster) will receive 30 micrograms Sm-p80 + 5 micrograms GLA-SE on Days 1, 29 and 180, Group D (mid dose standard schedule) will receive 30 micrograms Sm-p80 + 5 micrograms GLA-SE on Days 1, 29, and 57, and Group E (high dose standard schedule) will receive 100 micrograms Sm-p80 + 5 micrograms GLA-SE on Days 1, 29 and 57. Study duration is approximately 20 months and will be conducted at one site in the US. Participant duration for subjects is 15 months. The primary objective is to assess the safety and reactogenicity following receipt of three doses of 1) 100 micrograms Sm- p80 (unadjuvanted), 2) 10 micrograms Sm-p80 + 5 micrograms GLA-SE, 3) 30 micrograms Sm-p80 + 5 micrograms GLA- SE, and 4) 100 micrograms Sm-p80 + 5 micrograms GLA-SE administered intramuscularly on Days 1, 29, and 57 and 5) 30 micrograms Sm-p80 + 5 micrograms GLA- SE administered on Days 1, 29, and 180.

Conditions

  • Schistosomiasis

Interventions

BIOLOGICAL

Sm-p80

The Sm-p80 protein is formulated and lyophilized to yield the vaccine antigen, Sm-p80 for Injection.

BIOLOGICAL

Sm-p80 + GLA-SE

Combination vaccine containing Sm-p80 antigen and GLA-SE adjuvant.

Sponsors & Collaborators

  • National Institute of Allergy and Infectious Diseases (NIAID)

    lead NIH

Study Design

Allocation
NON_RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Model
SEQUENTIAL

Eligibility

Min Age
18 Years
Max Age
55 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2022-05-23
Primary Completion
2024-03-19
Completion
2024-03-19
FDA Drug
Yes

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05292391 on ClinicalTrials.gov