Antiviral Resistance Associated With Multiple Mutations Occurring in Seasonal Influenza A(H3N2) Virus in a Patient Treated With Oseltamivir.

Our case highlights the importance of early diagnosis in respiratory illness and timely detection of drug resistance so that antiviral treatment can be initiated and modified, particularly for high-risk groups. Vaccination and early, carefully dosed antiviral treatment are key to mitigating severe influenza cases, especially in immunocompromised patients.