Overview
- Data from the week of Sept. 14–20 show national sentinel reports rose to 8.48 patients per medical facility, a 1.53-fold jump from the prior week and a total of 31,428 cases.
- Okinawa is the clear early hotspot with 26.27 patients per sentinel, about 1.6 times the previous week, and its prefectural warning issued Sept. 11 remains in effect.
- Tokyo, Aichi and Kanagawa also reported high rates (15.21, 15.12 and 14.71 per sentinel respectively) and 46 prefectures have passed the epidemic-start benchmark of one patient per sentinel.
- The surge has produced measurable school disruptions, with 19 school closures, 171 grade-level closures and 870 class closures reported, creating short-term impacts on families and local staffing.
- Japan’s surveillance relies on about 3,000 sentinel clinics and uses clear benchmarks—one patient per sentinel signals epidemic start and ten triggers a national-style warning—so the current rise toward ten warrants close monitoring for more local advisories and health-system strain.