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Tokyo, August 20, 2025 — Japan has reported a historic high of 135 cases of severe fever with thrombocytopenia syndrome (SFTS), a potentially fatal tick-borne disease, so far this year, surpassing the previous record of 134 cases in 2023, according to data released by the Japan Institute for Health Security.
SFTS, a viral infectious disease transmitted through tick bites or contact with the blood of infected humans or animals, has claimed more than 10 lives in 2025, stressing the serious public health threat it poses. The Ministry of Health, Labour and Welfare is advising those working outdoors to cover their skin adequately to reduce the risk of infection.
Patients generally experience symptoms such as fever, vomiting, diarrhea, and altered consciousness after an incubation period ranging from about six days to two weeks. The disease is particularly severe in elderly individuals, with over 90% of cases found in patients aged 60 and above. The fatality rate for SFTS ranges from 10% to 30%, with the majority of deaths occurring in middle-aged and older adults.
The majority of SFTS cases this year have been concentrated in western Japan, with Kochi Prefecture reporting the highest number of cases at 14. However, cases have also been documented across central and eastern Japan, extending north to the main island of Hokkaido. The incidence of SFTS typically peaks from spring to autumn, aligning with the period of heightened tick activity. In the week ending August 10, eight new cases were recorded nationwide.
First identified in China in 2011 and introduced to Japan in 2013, SFTS currently has no vaccine available. While antiviral treatments exist, the focus remains on preventive measures, especially for those at higher risk.
Health authorities continue to monitor the situation closely to manage and contain the spread of this serious tick-borne illness as the summer tick season persists.
Disclaimer: This article is for informational purposes only and should not be considered a substitute for professional medical advice or treatment. Individuals experiencing symptoms or concerned about tick exposure should consult healthcare professionals promptly.
Reference: Japan Institute for Health Security data, August 19, 2025, as reported by Kyodo News and Japan Today.
