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Based on 2024-2025 seasonal data in Japan and the latest guidelines (Japanese Association for Infectious Diseases, Japan Society of Obstetrics and Gynecology, and MHLW 2025 Revision), this summary focuses on the severe illness risks and specific countermeasures for the elderly (aged 65 and over) and pregnant women.

The treatment for influenza (Type A and B) is primarily categorized into two classes of drugs: neuraminidase inhibitors (e.g., Tamiflu, Relenza) and endonuclease inhibitors (Xofluza). Based on the guidelines from the Japanese Association for Infectious Diseases and the Ministry of Health, Labour and Welfare, early administration within 48 hours of onset is recommended, and is expected to shorten the duration of symptoms by 1 to 2 days. For high-risk patients (elderly, those with underlying conditions, pregnant women), emphasis is also placed on the effect of preventing severe illness. The focus of this summary will be on Tamiflu (Oseltamivir), Xofluza (Baloxavir), and Nasal Sprays (Relenza).