Shipley

Researchers are studying the immune response and safety of mRNA-1018-H5, a pandemic influenza vaccine, in adults aged 18 years and older. The trial aims to assess how well two doses of this vaccine trigger antibody production and to monitor any side effects or reactions. This is a Phase 3, randomized, observer-blind, placebo-controlled study focused on the influenza virus. Participants will receive either the mRNA-1018-H5 vaccine or a placebo, both provided as sterile liquid injections. The study involves two doses and includes detailed monitoring for immune response and side effects after vaccination. The trial compares the vaccine to a placebo to evaluate its immunogenicity and safety. During the study, individuals will undergo medical evaluations including physical exams and pregnancy testing if applicable. Researchers will measure antibody levels at Day 43 and record any local or systemic reactions up to Day 29 after injections, as well as any adverse events up to Day 205. The study tracks serious and medically-attended adverse events to ensure careful safety monitoring throughout the participation period.