Safety, Reactogenicity, and Immunogenicity Study of a Self-Amplifying MRNA Influenza Vaccine in Healthy Adults

This is a Phase 1, first-in-human, randomized, placebo-controlled, observer blind study. The effect of two doses of an investigational vaccine on safety, reactogenicity, kinetics and magnitude of the post-vaccination antibody response will be evaluated at different timepoints as compared to placebo in healthy adults. Approximately 96 evaluable subjects will be enrolled in this study; n=72 receiving investigational vaccine and n=24 receiving placebo. The study has a screening period (Day -28 to Day -1), a treatment period (Day 1 to Day 43) and a follow-up period (Day 44 to Day 202).