According to the latest data released by Japan's National Institute for Health Crisis Management on the 2nd, from November 17 to 23, more than 3,800 designated medical institutions across Japan reported a total of 196,895 cases of influenza, with an average of 51.12 cases per hospital. According to the data, in the 47th week of 2025, each designated medical institution in Japan reported an average of 51.12 cases of influenza, about 1.35 times that of the previous week. The average number of weekly cases in each institution in Japan broke through 50 cases last year in the 52nd week, more than a month earlier this year. Japan's Ministry of Health, Labor, and Welfare said on December 1 that more than 90% of the influenza viruses currently prevalent in Japan are the “subbranch K” variant A (H3N2), which may be an important reason for the rapid spread of influenza this season. According to the Ministry of Health, Labor, and Welfare, of the 23 influenza virus strains collected and identified as subtype A (H3) in Japan from September to November 5, 22 were “subbranch K” variants, accounting for about 96%. This variant of the infection spreads more rapidly.

According to the latest data released by Japan's National Institute for Health Crisis Management on the 2nd, from November 17 to 23, more than 3,800 designated medical institutions across Japan reported a total of 196,895 cases of influenza, with an average of 51.12 cases per hospital. According to the data, in the 47th week of 2025, each designated medical institution in Japan reported an average of 51.12 cases of influenza, about 1.35 times that of the previous week. The average number of weekly cases in each institution in Japan broke through 50 cases last year in the 52nd week, more than a month earlier this year. Japan's Ministry of Health, Labor, and Welfare said on December 1 that more than 90% of the influenza viruses currently prevalent in Japan are the “subbranch K” variant A (H3N2), which may be an important reason for the rapid spread of influenza this season. According to the Ministry of Health, Labor, and Welfare, of the 23 influenza virus strains collected and identified as subtype A (H3) in Japan from September to November 5, 22 were “subbranch K” variants, accounting for about 96%. This variant of the infection spreads more rapidly.