
Powassan virus spikes to record US cases, with rapid transmission and no vaccine
Powassan virus, a rare tick-borne illness with no vaccine, has surged to a record high in the United States (76 diagnosed in 2025). The virus can be transmitted in as little as 15 minutes after a tick bite, can cause severe neurological complications, and currently has no specific treatment or vaccine, making prevention (tick bite avoidance) crucial—especially for children, older adults, and immunocompromised individuals.

