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Apr 28, 2026

Rare tick-borne virus with no cure spreads across the US as cases hit record high – how to avoid it

Health officials are raising concerns after a rare tick-borne virus reached its highest number of reported U.S. cases on record.

The Powassan virus, which has no specific treatment or cure, infected 76 Americans in 2025 – the highest annual total ever documented. By comparison, the disease has historically been extremely rare, averaging just seven reported cases per year, according to VT.

The virus was first identified in 1958 after a four-year-old boy developed unexplained symptoms.

According to Cleveland Clinic, the virus comes “from the bite of an infected Ixodes tick. Ixodes scapularis, commonly called blacklegged or deer ticks, are the most likely to spread it to people. Ixodes cookei (groundhog tick) and Ixodes marxi (squirrel tick) also carry Powassan virus, but they rarely bite people. Unlike some other tick-borne illnesses, a tick only needs to attach to you for a few minutes to infect you with Powassan virus.

Dr. Jorge Parada, medical advisor at the National Pest Management Association in Chicago, told Fox News, said: “Powassan can be transmitted in as little as 15 minutes after the infected tick bites, while Lyme disease usually requires a 36- to 48-hour attachment time for transmission.”

The Powassan virus

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