
Powassan virus spreads rapidly in US with record case count
A rare tick-borne illness, Powassan virus, is spreading across the United States with a record 76 cases diagnosed in 2025. The virus can be transmitted in as little as 15 minutes after a tick bite and can progress to severe neurological disease such as encephalitis or meningitis, with about 10% of severe cases resulting in death. There are no vaccines or targeted treatments, and risk is highest for children, older adults, and immunocompromised individuals. Prevention focuses on avoiding tick bites and promptly removing ticks, especially during peak tick season.










