Powassan Tick Virus Is Rising in the U.S., with Transmission Possible in Minutes

Powassan virus, carried by ticks such as the groundhog tick, squirrel tick, and blacklegged (deer) tick, is on the rise in the United States, especially in the Northeast and Great Lakes regions. There are no vaccines or medicines to prevent or treat the infection, and the virus can be transmitted to humans in as little as 15 minutes after a tick bite. Most cases may not show symptoms, but serious outcomes can include encephalitis or meningitis. Prevention hinges on avoiding ticks, using repellents, checking for ticks after outdoor activities, and treating clothing with permethrin.