NCT06141057

A Study to Compare Two Dosing Regimens for a New Malaria Vaccine

Phase I Clinical Trial to Assess the Safety and Immunogenicity of the Malaria Vaccine Candidate RH5.1 Soluble Protein in Matrix-MTM Using Two Dosing Regimens

• Status: Active Not Recruiting
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 24 (estimated)
• Sponsor: University of Oxford · Academic / Other
• Sex: All
• Age: 18 Years – 50 Years
• Healthy volunteers: Accepted

Summary

Malaria is a major public health problem. There were around 240 million cases of malaria and 627,000 deaths worldwide in 2020. Most of the deaths are in children under five living in Africa. It is a major problem for those who live in affected areas and for travellers. There is a great need for a safe, effective malaria vaccine. This study is being done to evaluate an experimental malaria vaccine for its safety and also look at the body's immune response to the vaccine. The vaccine tested in this study is called and "RH5.1". This is given with an adjuvant called "Matrix-M". This is a substance to improve the body's response to a vaccination. The aim is to use the vaccines and adjuvant to help the body make an immune response against parts of the malaria parasite. This study will assess: 1. The safety of the vaccines in healthy participants. 2. The response of the human immune system to the vaccines. This will be achieved by giving participants three doses of the RH5.1 vaccines at two different dose levels (10 micrograms and 50 micrograms). One group will have 3 doses of 10 micrograms given at 0, 1 and 6 months whilst the other will receive 2 doses of 50 micrograms (at 1 and 2 months) followed by a 10 microgram dose at 6 months- known as a 'delayed fractional dose'. Blood tests and information about any symptoms will be performed/collected that occur after vaccination. Information from previous studies suggests that a delayed fractional dose improves the immune response to the vaccine, particularly in terms of the antibody response. Current prediction is that this improvement is due to the delay in dosing, rather than the reduction in dose, and this study will help to answer that. Having a vaccine at a single dose is important for efficient production and dosing for vaccines rolled out in national programs so being able to move away from 'delayed fractional dose' regimens to 'delayed final dose' regimens will be important for vaccine development.

Conditions

• Malaria
• Malaria,Falciparum
• Protozoan Infections
• Parasitic Disease
• Infections
• Vector Borne Diseases

Interventions

Type	Name	Description
BIOLOGICAL	Matrix M with RH5.1	50 µg of Matrix-M adjuvant with RH5.1 at different doses on days 0 and 28.

Timeline

• Start date: 2023-06-06
• Primary completion: 2025-07-01
• Completion: 2025-07-01
• First posted: 2023-11-21
• Last updated: 2024-10-04

Locations

1 site across 1 country: United Kingdom