Powassan Virus Spreads in U.S., Killing 10% to 15% of Severe Cases
Updated
Updated · Fox Weather · Jun 18
Powassan Virus Spreads in U.S., Killing 10% to 15% of Severe Cases
3 articles · Updated · Fox Weather · Jun 18
Summary
Fewer than 10 U.S. Powassan cases have been reported so far in 2026, but health officials are warning that the rare tick-borne virus can turn deadly quickly as tick season intensifies.
15 minutes after a bite, an infected black-legged deer tick can transmit Powassan—far faster than Lyme disease—triggering encephalitis, seizures, paralysis and other brain-related complications.
About 10% to 15% of severe cases are fatal, and roughly half of survivors suffer permanent neurological damage; there is no specific treatment beyond supportive care.
Roughly 200 cases have been reported nationwide since 2012, with older adults, young children and immunocompromised people facing the highest risk during late spring through mid-fall.
Pennsylvania’s warm, rainy weather has helped ticks thrive, prompting advice to use repellent, wear long clothing, avoid brushy areas and check for ticks after time outdoors.