A severe case of Powassan virus disease has been reported in a resident of Concord, New Hampshire, acquired through a tick bite.
The patient has been hospitalized for several weeks. Historically, three to four cases are diagnosed annually in the state.
Nationally, 2025 saw 76 cases and 10 deaths.
The virus is transmitted by Ixodes scapularis ticks and can cause neuroinvasive disease with a case fatality rate of 10–15%.
Caution against tick and mosquito bites is advised.
