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Efficacy, Immunogenicity and Safety Study of GSK Biologicals' Candidate Malaria Vaccine Evaluating Different Dose Schedules in a Sporozoite Challenge Model in Healthy Malaria-naïve Adults

NCT03162614 · Status: COMPLETED · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 154

Last updated 2020-10-27

Study results available
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Summary

This study is designed to evaluate efficacy, immunogenicity and safety of various dose schedules of GSK Biologicals' candidate malaria vaccines RTS,S/AS01B (adult formulation) and RTS,S/AS01E (pediatric formulation) in healthy malaria-naïve subjects aged 18-55 years. The purpose of this study is to investigate whether changes in dosing schedule are associated with increased or equivalent protection, and to evaluate the immune mechanisms associated with vaccine efficacy under varying dosing schedules.

Conditions

Interventions

BIOLOGICAL

RTS,S/AS01E

Subjects will receive intramuscular injection of RTS,S/AS01E.

BIOLOGICAL

RTS,S/AS01B

Subjects will receive intramuscular injection of RTS,S/AS01B.

PROCEDURE

Sporozoite-infected mosquitoes challenge.

Mosquitoes infected approximately 2-3 weeks earlier that are likely to contain sporozoites in their salivary glands will be allowed to feed on the subjects. For each subject, five mosquitoes will be allowed to feed over five minutes, after which they will be dissected to confirm how many were infected, and the salivary glands scored. If required additional mosquitoes will be allowed to feed until a total of five infected mosquitoes with a minimum of 2+ salivary gland scores have fed. The challenge occurs approximately 90 days (three months) after the last vaccination. Subjects will be monitored during 28 days after having bitten by mosquitoes and when parasites are found in their blood, they will be treated with appropriate anti-malarial drugs.

Sponsors & Collaborators

  • The PATH Malaria Vaccine Initiative (MVI)

    collaborator OTHER

  • GlaxoSmithKline

    lead INDUSTRY

Principal Investigators

  • GSK Clinical Trials · GlaxoSmithKline

Study Design

Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Model
PARALLEL

Eligibility

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

Timeline & Regulatory

Start
2017-05-24
Primary Completion
2018-07-09
Completion
2018-09-24
FDA Drug
Yes

Countries

  • United States

Study Locations

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Entities

Diseases
Companies

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 NCT03162614 on ClinicalTrials.gov