Siberian Tick-Borne Diseases Surge Across Russian Regions in 2025

Siberian tick-borne illnesses have affected multiple Russian regions in 2025. Both Siberian tick-borne encephalitis and Siberian tick typhus have been reported, with varying incidence rates across areas. The diseases carry serious health risks, including severe neurological damage. Siberian tick-borne encephalitis is an acute infection targeting the central nervous system. Symptoms appear suddenly and include chills, intense headaches, muscle pain, nausea, vomiting, and a rapid fever rise to 38–39°C. Without treatment, the illness can cause paralysis, long-term disability, or death.

Siberian tick typhus spread across 14 Russian regions in 2025. The Altai Republic recorded the highest number of cases, with 89 infections at a rate of 42.29 per 100,000 people. Altai Krai followed with 305 cases, an incidence of 14.47 per 100,000. Novosibirsk Oblast reported 102 cases, including one fatality, at a rate of 3.66 per 100,000. Omsk Oblast had a much lower rate of 0.06 cases per 100,000 people. The 2025 data shows significant variation in tick-borne disease cases across regions. Altai Republic and Altai Krai experienced the highest infection rates. Novosibirsk Oblast confirmed a fatality, highlighting the potential severity of these illnesses.