日本再度达到流感流行警报级别

Core Insights - Japan's Ministry of Health, Labour and Welfare reported a resurgence of influenza cases, with an average of 30.03 cases per designated medical institution during the week of January 26 to February 1, reaching the epidemic warning level again [1] - A total of 114,291 influenza cases were reported across over 3,800 medical institutions, exceeding the threshold for issuing an epidemic warning [1] - The resurgence has led to the closure or partial closure of 6,415 educational facilities nationwide, with nearly 60% being elementary schools [1] Summary by Sections - Influenza Cases: The average number of reported influenza cases per medical institution was 30.03, surpassing the epidemic warning threshold [1] - Total Cases: Over 114,291 cases were reported in total, indicating a significant increase in influenza activity [1] - Impact on Education: The increase in influenza cases has resulted in widespread school closures, affecting 6,415 educational facilities [1] - Previous Trends: Prior to this resurgence, the last recorded epidemic level was during the week of November 10 to 16, 2025, with an average of 37.73 cases per institution [1] - Virus Strains: The majority of influenza cases were attributed to the H3N2 virus variant, with a noted increase in the proportion of influenza B virus infections since late 2025 [1] - Expert Analysis: Experts suggest that the alternating prevalence of different virus strains may contribute to the fluctuations in influenza activity [1]