A Study to Learn About the Study Medicine Sisunatovir in Adults With Respiratory Syncytial Virus (RSV) Infection

An Interventional Phase 2/3, Adaptive, Multi-Center, Randomized, Double-Blind Study to Investigate Efficacy and Safety of Oral Sisunatovir Compared With Placebo in Non-Hospitalized Symptomatic Adults With Respiratory Syncytial Virus Infection Who Are at Risk of Progression to Severe Illness