Safety and Immunogenicity of ChAd63 RH5 and MVA RH5 in Adults, Young Children and Infants Living in Tanzania

Malaria,Falciparum Clinical Trial

Official title: A Phase Ib Age De-escalation Dose-escalation Randomised, Double-blind, Controlled Study of the Safety and Immunogenicity of ChAd63 RH5 and MVA RH5 Given Intramuscularly at 0 and 2-months in Healthy Adults, Children and Infants in Tanzania

Status Completed

Clinical Trial Summary

This is a dose-escalation, age de-escalation randomised double-blind controlled Phase Ib trial to assess the safety, tolerability and immunogenicity of ChAd63-RH5 administered with MVA-RH5 in a heterologous prime-boost regimen. Adults (18-35 years), young children (1-6 years) and infants (6-11 months) will be enrolled in the study. Safety data will be collected for each of the vaccination regimens. The humoral and cellular immune responses generated by each of these regimens will be assessed.

Clinical Trial Description

• Experimental design: Phase Ib, double blind, age de-escalation dose-escalation, randomized (2:1 ratio), controlled trial.

• Healthy adults (18-35 years), young children (1-6 years) and infants (6-11 months) will be screened; those determined to be eligible, based on the inclusion and exclusion criteria, will be enrolled in the study.

• Route of administration of ChAd63-RH5 (day 0) and MVA-RH5 (2 months): both vaccines will be administered by the intramuscular route to the left deltoid.

• Each participant will be observed for at least 1 hour after vaccination to evaluate and treat any acute adverse events (AEs).

• There will be 7-day follow-up period for solicited AEs post-vaccination: Day 0, 2 and 7 evaluations will be carried out by the study clinician at the study centre and day 1, 3, 4, 5 and 6 evaluations will be carried out by a trained community health worker in the participant's home, after each vaccination.

• There will be a 28-day (day of vaccination and 28 subsequent days) follow-up after each vaccine dose for reporting unsolicited symptoms.

• Serious adverse events (SAEs) will be recorded throughout the study period. Prior to vaccination, any SAEs due directly to study procedures will be captured. All SAEs will be captured beginning with the administration of the priming dose of ChAd63 RH5 and ending 4 months after the booster dose with MVA RH5.

• Antibodies to RH5_FL will be determined at baseline and 14, 28, 56, 63, 84, 112, 140 and 168 days after ChAd63 RH5 in all participants.

• Cellular immune responses to RH5 will be evaluated at baseline and 14 (adults only), 28, 56, 63, 84 and 168 days after ChAd63 RH5 in all participants.

• The duration of involvement in the study from enrolment will be approximately 6 months. The vaccination phase of the study takes 9 weeks and the post-vaccination follow-up lasts for 4 months after the last dose. ;

Related Conditions & MeSH terms

• Malaria, Falciparum
• Malaria,Falciparum

• NCT number: NCT03435874
• Study type: Interventional
• Source: University of Oxford
• Status: Completed
• Phase: Phase 1
• Start date: April 12, 2018
• Completion date: July 11, 2019