Hand, foot and mouth disease cases in Japan have exceeded the national alert level for the first time in two years [1].
The spike in infections represents a significant public health concern as the virus spreads rapidly among children during the summer months. The surge puts additional pressure on pediatric clinics and childcare facilities across the country.
Data covering the week ending July 5, 2026, show that the average number of patients per reporting medical institution rose to 7.03 [1]. This figure surpasses the established alert level threshold of five patients per institution [1]. Nationwide, a total of 15,845 patients were reported during that week [1].
Approximately 2,000 medical institutions provided the data for this reporting period [1]. The distribution of the virus is widespread, with 27 prefectures exceeding the alert level, excluding those in the Hokkaido and Tōhoku regions [1].
Shimane Prefecture reported the highest concentration of the illness, averaging 18 patients per institution [1]. Other regions showing high transmission rates include Saga, Tokyo, Chiba, Toyama, and Nara, all of which recorded 10 or more patients per institution [1].
The Ministry of Health, Labour and Welfare said the disease spreads via droplets and direct contact. To curb the transmission of the virus, the ministry said the public should prioritize frequent hand-washing and avoid the use of shared towels [2].
Hand, foot and mouth disease is most common in young children, though it can affect patients of all ages. The current numbers indicate a return to higher transmission levels not seen since 2024 [1].
“Average patients per medical institution rose to 7.03, exceeding the alert level of five.”
The breach of the alert level indicates that the 2026 summer season is seeing a more aggressive transmission cycle than the previous two years. Because the virus spreads through close contact and respiratory droplets, the high concentration in urban centers like Tokyo and regional hotspots like Shimane suggests that childcare and school environments are likely primary drivers of the current outbreak.
