Ebino

This research aims to evaluate the antiviral effects of S-337395 compared with placebo in nonhospitalized adult participants who have symptomatic respiratory syncytial virus (RSV) infection and are at high risk of progressing to severe disease. The study focuses on adults with recent onset of RSV symptoms and important risk factors such as advanced age or chronic lung or cardiovascular disease. It is designed as a Phase 2b, randomized, double-blind, placebo-controlled trial to assess safety, tolerability, and efficacy. Participants will receive either S-337395 or a matching placebo according to a specified dosing schedule. The treatment begins within 72 hours of RSV symptom onset. The study measures changes in RSV viral RNA load from baseline to Days 2, 4, and 6 using nasopharyngeal swabs and quantitative reverse transcription polymerase chain reaction (qRT-PCR) tests to monitor antiviral effects. During the study, participants will be monitored for safety and effectiveness through viral load testing at multiple time points. Medical history, physical exams, vital signs, and ECGs are conducted to ensure stability aside from RSV symptoms. The study also tracks symptoms and any adverse events to evaluate treatment tolerability. Total participation includes screening and follow-up assessments as outlined by the study protocol.