Oseltamivir and Baloxavir Marboxil for Prophylaxis Against Influenza Under a Hospital-based Setting

Baloxavir marboxil will be administered on the first day following the close contact's enrollment in this study. Participants weighing ≤80 kg will receive 40 mg of baloxavir marboxil, while those weighing ≥80 kg will receive 80 mg.

Oseltamivir will be administered once daily for 5 consecutive days following the close contact's enrollment in this study. Participants will receive 75 mg of oseltamivir once each day.