News - Cases of the Powassan virus increase in the U.S., prompting a warning from health experts.

The Powassan virus, a rare but potentially deadly tick-borne disease, is seeing an alarming rise in cases across the United States, sparking concern among health professionals. Originally identified in 1958 in a young Canadian boy, the virus has reached record levels, with 76 Americans diagnosed in 2025, as reported by the CDC—a stark increase from the usual seven to eight cases annually. Named after the Ontario town near its initial discovery, the virus transmits to humans primarily through infected woodchuck and deer ticks. Its peak occurrence aligns with the high tick activity period from late spring to mid-fall, posing heightened risks to outdoor enthusiasts. Unlike Lyme disease, which requires a longer attachment period post-bite, Powassan can be contracted in just 15 minutes, making it particularly perilous. Dr. Jorge P. Parada from the National Pest Management Association emphasizes the virus's rapid transmission speed as a significant concern, heightening the risk of infection. Symptoms of Powassan may range from mild, including fever and headaches, to severe, with potential neurological complications like encephalitis and meningitis. Dr. Marc Siegel notes the virus incubation period spans one to four weeks, with some stricken individuals showing no symptoms until advanced stages. Currently, there are no specialized treatments or vaccines for Powassan virus, and medical care is limited to supportive measures such as hydration therapy and respiratory support. Children, the elderly, and immunocompromised individuals are particularly vulnerable to severe disease. Despite its rarity compared to Lyme disease, experts urge vigilance and preventive measures, such as using insect repellents and conducting thorough tick checks after outdoor activities, to combat this growing public health concern.