Efficacy of Baloxavir Against Influenza in Hospitalized Patients: the INFLUENT Study (INpatients InFLUENza Treatment)

"The antiviral baloxavir marboxil administered in one unique dose.~1 capsule (40 mg) if participant weighs \< 80 kg; 2 capsules (80 mg) if participant weighs ≥ 80 kg"

Patients in the placebo group will receive one unique dose of placebo. 1 capsule if participant weighs \< 80 kg; 2 capsules (80 mg) if participant weighs ≥ 80 kg.