[CLSTR]
< Back to situation

[REVISION HISTORY]

Unusually early influenza epidemic spreads across Japan

Updated 12 times since CLSTR started tracking revisions of this situation.

What changed

2026-10-14 23:29 UTC → 2026-10-19 15:50 UTC · added removed

Influenza Unusually early influenza epidemic reaches all prefectures in spreads across Japan

The influenza epidemic in Japan has expanded significantly, reaching reached epidemic levels across all prefectures. Data from the prefectures, characterized by an unusually early onset. The Ministry of Health, Labour and Welfare for the week of September 21–27 shows the average number of reported cases per medical institution was 7.17, well above that the threshold of 1 person. Okinawa reported for epidemic status was met during the highest infection rates at 42.50 cases per institution, surpassing week of August 17, marking the alarm level. Other prefectures, including Saitama, Ibaraki, Aichi, and Gifu, second earliest onset on record since 1999. Regional outbreaks have exceeded advisory levels. This follows earlier reports from Ishikawa and Toyama prefectures, where been widespread. Iwate Prefecture reported cases surged following the Silver Week holidays. Medical experts confirm the season is starting earlier than usual. To mitigate the spread, health officials recommend frequent handwashing, wearing masks doubling in crowded areas, proper ventilation, and maintaining indoor humidity between 50% and 60%. Regarding vaccination, experts note that while a single dose is generally sufficient for individuals aged 13 week, while Kyoto and older, the duration Niigata have also entered epidemic periods. In Ishikawa, a cluster of protection depends on circulating strains. While protection typically lasts approximately five months, effectiveness against the H3 subtype may be lower or shorter-lived, particularly among elderly populations. By the 40th week (September 28 85 students at Komatsu Technical High School led to October 4), the National Institute of Infectious Diseases reported a significant rise in infections. Influenza school closures. Oita Prefecture officially declared an epidemic on September 9, and cases have been increasing in Japan increased 1.6 times compared to previous periods, 39 prefectures nationwide, with reported cases exceeding 40,000 for Okinawa reporting the first time this season. Experts highest infection rates. Medical experts suggest the early surge may be driven by a virus strain that was not dominant last season, leaving many without immunity. Other contributing factors include increased inbound tourism, international travel from following the Southern Hemisphere, prolonged rainy seasons, Obon holiday, and decreased physical activity due to weather. In Ishikawa Prefecture, cases increased by 30% poor ventilation in air-conditioned spaces during extreme heat. Health officials have noted that warm weather can complicate diagnosis, as approximately 20 percent of patients may not present with a single week, fever, potentially leading to confusion with heatstroke. In response, several schools reporting outbreaks that led municipalities, including Tokyo’s Shinagawa and Minato wards and Yokosuka City, have moved up vaccination schedules for the elderly to class closures. late September. Public health officials continue to recommend handwashing, gargling, mask-wearing in crowded areas, and maintaining indoor humidity between 50% and 60%.

Versions

  1. 2026-10-19 15:50 UTC Unusually early influenza epidemic spreads across Japan
  2. 2026-10-14 23:29 UTC Influenza epidemic reaches all prefectures in Japan
  3. 2026-10-14 20:37 UTC Influenza epidemic reaches all prefectures in Japan
  4. 2026-10-13 23:02 UTC Influenza epidemic reaches all prefectures in Japan
  5. 2026-10-13 09:32 UTC Early influenza epidemic in Japan
  6. 2026-10-02 12:51 UTC Early influenza epidemic in Japan
  7. 2026-10-01 00:51 UTC Early influenza epidemic in Japan
  8. 2026-09-18 02:45 UTC Early influenza epidemic in Japan
  9. 2026-09-16 04:06 UTC Early influenza epidemic in Japan
  10. 2026-09-12 00:12 UTC Early influenza epidemic in Japan
  11. 2026-09-10 04:13 UTC Early influenza epidemic in Japan
  12. 2026-09-08 01:44 UTC Early influenza epidemic in Japan
  13. 2026-09-06 02:31 UTC Early influenza epidemic in Japan

Only revisions since CLSTR began indexing content versions appear here. Select a version to see what changed compared to the one before it.