Siberian Tick Typhus Surges Across 14 Russian Regions in 2025

Siberian tick typhus spread across 14 Russian regions in 2025. The disease affected areas with varying severity, from low incidence to high case numbers. Health authorities recorded both infections and fatalities linked to the illness. The Altai Republic reported the highest rate of Siberian tick typhus in 2025. With 89 cases, the region saw an incidence of 42.29 per 100,000 people. Altai Krai followed with 305 infections, a rate of 14.47 per 100,000.

Novosibirsk Oblast had 102 cases, including one death, at a rate of 3.66 per 100,000. Omsk Oblast recorded a much lower rate of 0.06 per 100,000. Both regions were among the 14 with confirmed cases.

Siberian tick-borne encephalitis, a separate but related disease, poses serious risks. It is an acute infection targeting the central nervous system. Symptoms include sudden chills, severe headaches, muscle pain, nausea, vomiting, and a rapid fever reaching 38–39°C. In severe cases, it can cause paralysis, long-term disability, or death. The 2025 data highlights regional differences in Siberian tick typhus spread. Altai Republic and Altai Krai experienced the highest infection rates. The disease remains a significant health concern, with encephalitis cases carrying severe potential complications.