Key Facts
• Influenza cases in Shizuoka reached 41.26 per medical institution, surpassing the 30-case warning threshold.
• The 2025 influenza warning was issued earlier than in 2009 and 2023.
• A new variant, H3 subtype “Subclade K,” accounts for 96% of cases.
• Shizuoka clinics report up to 60 influenza patients in a single afternoon in November.
• Experts attribute the surge to reduced immunity due to the absence of outbreaks last year.
• Doctors recommend vaccinations, avoiding crowded areas, and early rest for symptoms.
• Basic preventive measures like handwashing, masks, and cough etiquette remain crucial.
Summary
Shizuoka is experiencing a rapid influenza outbreak, with cases surpassing warning levels earlier than usual. The dominant strain, H3 “Subclade K,” is linked to reduced immunity from last year’s lack of outbreaks. Clinics report unprecedented patient surges, with up to 60 cases in a single afternoon. Experts emphasize vaccinations, avoiding crowds, and early symptom management. Basic hygiene practices, including handwashing and mask usage, are critical to controlling the spread.
