Japan is experiencing a rise in severe fever with thrombocytopenia syndrome (SFTS), a tick-borne disease with a reported fatality rate of 27% [1].

The increase in infections poses a significant public health risk because the disease is often fatal and the vectors are expanding their reach. Experts are now investigating the role of wildlife in spreading the virus to humans.

SFTS was first recorded in Japan in 2013 [4]. Since that initial case, the number of infected individuals has continued to grow every year, Koichi Goka, a specially appointed researcher at the National Institute for Environmental Studies, said.

Recent data indicates a sharp climb in confirmed cases. Reports from earlier this month show 72 cases as of the 7th [2], while subsequent data showed 135 cases by the 10th [1]. The discrepancy in numbers reflects the rapid pace of reporting during the current surge.

Research suggests that the expansion of tick habitats is a primary driver of the outbreak. However, a new theory suggests that bears may be acting as unexpected virus carriers, transporting the ticks and the virus into new areas.

Patients describe the psychological toll of the diagnosis. One anonymous male patient said, "I knew that the infectious disease called 'SFTS' has a high fatality rate, and I was scared."

Public health officials continue to monitor the spread of the virus nationwide. The combination of expanding tick populations and the movement of large mammals like bears creates a complex challenge for containment and prevention.

“The fatality rate of SFTS in Japan is reported at 27%.”

The potential role of bears as virus carriers suggests that SFTS is not merely a localized environmental issue but a zoonotic challenge linked to wildlife migration. As bears move closer to human settlements, the risk of tick-borne transmission increases, necessitating a shift in public health strategies to include wildlife management alongside traditional medical warnings.