Japan faces a sharp rise in influenza cases, prompting an official influenza outbreak alert from the Ministry of Health, Labor, and Welfare. Between October 27 and November 2, 2025, medical institutions nationwide reported 57,424 influenza cases, more than double the previous week. The average of 14.90 cases per institution exceeded the alert threshold of 10, signaling a potential major outbreak in the coming month.
Prefectures in the capital region recorded some of the highest figures. Miyagi reached 28.58 cases per institution, Kanagawa 28.47, and Saitama 27.91, all approaching the warning level of 30. In addition, Chiba registered 25.04, Tokyo 23.69, Hokkaidō 24.99, and Okinawa 23.80. Overall, 25 of 47 prefectures reported averages above the critical level of 10.
The rise in influenza cases has led to significant school disruptions. Authorities confirmed partial or full closures at 2,307 kindergartens, nurseries, elementary schools, junior high schools, and high schools across Japan. Officials stressed that the closures aim to limit the spread of infections and protect vulnerable populations.
Health authorities warned the public to maintain vigilance and practice preventive measures, including frequent handwashing, mask-wearing, and avoiding crowded spaces. Medical experts emphasized that early treatment is crucial for high-risk groups, such as the elderly, children, and those with underlying conditions.
The Ministry of Health, Labor, and Welfare continues to monitor the situation closely, urging medical institutions to report cases promptly. They are also coordinating with local governments to ensure hospitals and clinics are prepared for an expected increase in patients.
Officials encouraged parents and guardians to stay informed about school closures and local health advisories. Citizens are advised to consult healthcare providers if they develop influenza-like symptoms and to consider vaccination where possible.
The current influenza outbreak alert underscores the need for heightened public awareness, timely reporting, and coordinated preventive actions across all prefectures. Authorities reiterated that community cooperation remains vital to controlling the spread of the virus.
Influenza outbreak alert signals the urgency of maintaining public health measures to reduce infections, manage healthcare resources, and minimize disruptions. Local governments and citizens must work together to navigate this heightened influenza season effectively.
