Safety and Immunogenicity of a Candidate Rift Valley Fever Vaccine (RVF003)

Plain-language summary

The goal of this clinical trial is to learn if ChAdOx1 RVF, a candidate vaccine against RVF, provides an adequate immune response and determine its safety among Kenyan adults. The main aims are: * To assess the proportion of individuals mounting an immune response following vaccination with a single dose of ChAdOx1 RVF * To monitor occurrence of any adverse events following vaccination * To assess whether two doses of ChAdOx1 RVF elicit an immune response that is more durable than that generated by a single dose of ChAdOx1 RVF Researchers will compare ChAdOx1 RVF vaccine to a rabies vaccine in 240 participants. Participants will be randomly allocated to one of three study groups and vaccinated with ChAdOx1 RVF or a control Rabies vaccine as follows. Group 1, composed of 120 participants, will receive a single dose of ChAdOx1 RVF vaccine at baseline and a single dose of rabies vaccine 3 months later. Group 2, composed of 60 adults, will receive two doses of ChAdOx1 RVF; the first dose at baseline and the second dose 3 months later. Group 3, composed of 60 adults, will receive two doses of rabies vaccine; the first dose at baseline and the second dose 3 months later. Participants will receive daily phone calls after each vaccination for the following six days to gather information on any symptoms they may experience. Participants will be instructed to contact the study team at any time should they experience any clinical symptoms. Blood samples will be collected at baseline (before vaccination) and at scheduled follow-up visits (8 visits over the duration of the study, i.e. days 7, 14, 28, 84, 91, 112, 365 and 540 after the first vaccination) for monitoring of immune responses. Up to 20mls of blood will be collected at each scheduled visit. Participants will be followed-up for 18 months from the first dose of vaccine. Adverse events following vaccination will be monitored throughout the study and reviewed by an independent Data and Safety Monitoring Board (DSMB)

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