According to data released by the National Health Crisis Management Research Agency of Japan on October 21, from October 6 to 12, more than 3,800 targeted medical institutions in Japan more than 9,000 cases of influenza, and the number of new cases has increased every week for 8 consecutive weeks.

The latest data show that in the 41st week of 2025 (October 6-12), more than 3,800 medical establishments across Japan a total of 9,073 cases of influenza, averaging 2,36 cases per household, about 1.5 times the previous week and 2.65 times the same period last year.

According to Japan¡¯s standards, the average number of cases of influenza per week by each medical establishment is more than 1, which marks the entry into the flu epidemic season, and if this number is more than 10, it reaches the ¡°warning alert¡± level (lower than the alert level). According to this standard, in the 41st week of 2025, about two-thirds of the 47 prefectures across Japan have entered the flu season.

According to the latest data of the Japanese Ministry of Health and Labour, affected by the spread of the flu, as of the 12th, a total of 998 kindergartens, kindergartens, primary and secondary schools were shut down or part of the year, class stop, and only from October 6 to 12 this week there were 328 educational institutions shut down or part of the school.

The Ministry of Health and Labour of Japan announced on October 3 that the country has entered the flu season, five weeks earlier than in 2024.