Asian Flu (H2N2) Treatment: Symptom Relief and Antiviral Options

The 1957–1958 Asian flu pandemic (H2N2) is historical; current seasonal influenza treatment principles apply.

Supportive Care

• Rest, hydration, antipyretics/analgesics (acetaminophen, ibuprofen – avoid aspirin in children).

Antiviral Medications (Neuraminidase Inhibitors)

• Oseltamivir (Tamiflu): Oral, 75 mg BID × 5 days (adults); weight-based pediatric dosing.
• Zanamivir (Relenza): Inhaled, 10 mg BID × 5 days; not for underlying airway disease.
• Peramivir (Rapivab): Single IV dose.
• Baloxavir (Xofluza): Single oral dose (cap-dependent endonuclease inhibitor).

Critical window: Start within 48 hours of symptom onset for maximal benefit (reduces duration ~1 day, complications, transmission).

High-Risk Groups for Antivirals

• Age ≥65 or <2 years
• Pregnancy/postpartum
• Chronic medical conditions (cardiopulmonary, metabolic, immunosuppressive)
• Residents of chronic care facilities

Prevention

Annual influenza vaccination remains the cornerstone.