Which viral infection is primarily treated using Oseltamivir (Tamiflu)?

Oseltamivir, commonly known as Tamiflu, is specifically indicated for the treatment and prevention of influenza virus infections. This antiviral medication works by inhibiting the neuraminidase enzyme on the surface of the influenza virus, which plays a crucial role in the virus's ability to replicate and spread within the respiratory tract. By blocking this enzyme, Oseltamivir helps to reduce the severity and duration of flu symptoms when given early in the course of the illness.

Unlike the other viral infections listed, such as HIV, Herpes Simplex Virus, and Hepatitis B, which require different classes of antiviral medications, Oseltamivir is exclusively effective against influenza. This highlights the importance of targeted antiviral therapies tailored to specific viral pathogens, ensuring optimal efficacy in managing viral infections.