Japan has officially entered its 2026 influenza season, marking the second-earliest start since record-keeping began in 1999, according to the country’s Health Ministry. Health officials are urging residents to take preventive measures as flu cases begin rising across the country.
The ministry announced that the average number of influenza patients reported by approximately 3,000 designated medical institutions nationwide reached 1.11 cases per institutionduring the latest reporting week. A figure of 1.0 or higher is considered the threshold indicating the start of flu season.
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The current flu season began earlier than usual, becoming the second-earliest start on record after 2009. Health authorities are closely monitoring the situation as influenza activity increases in several regions.
Prefectures reporting the highest flu activity included:
● Okinawa: 4.43 cases per institution
● Iwate: 2.10 cases per institution
● Aomori: 2.08 cases per institution
Meanwhile, some prefectures, including Shimane, reported significantly lower case numbers.
Health Ministry Urges Precautions
Officials are encouraging the public to take standard flu-prevention measures as the season begins.
Recommended precautions include:
● Frequent handwashing
● Wearing masks in crowded settings
● Receiving influenza vaccinations
● Maintaining good ventilation indoors
● Staying home when experiencing flu symptoms
The ministry emphasized that early preventive action can help reduce transmission and protect vulnerable groups such as older adults, young children, and people with underlying health conditions.
1. Unusually Early Start
The 2026 season is the second-earliest flu season recorded in Japan since 1999.
2. Public Health Preparedness
An early start gives healthcare providers and communities more time to prepare for potential increases in cases.
3. Importance of Vaccination
Health authorities continue to emphasize vaccination as one of the most effective tools against seasonal influenza.
4. Protecting Vulnerable Populations
Early prevention can help reduce severe illness among high-risk groups.
Japan’s official entry into the 2026 flu season serves as an early reminder for residents to remain vigilant. With influenza activity already exceeding the national threshold and the season starting unusually early, health authorities are encouraging vaccinations and preventive measures to help limit the spread of the virus in the months ahead.
