Rare tick-borne virus turns deadly fast as US cases reach record high

2 hours ago

Powassan virus was first identified in 1958 after a 4-year-old Canadian boy died from an unexplained condition.
Cases in the U.S. reached a record high of 76 in 2025, up from an average of 7-8 annually previously.
The virus is transmitted by infected woodchuck or deer ticks, with transmission possible in as little as 15 minutes after a bite.
Symptoms include fever, headache, vomiting, and weakness, and can progress to severe neurological complications like encephalitis and meningitis.
Approximately 10% of severe cases are fatal, and survivors often face long-term neurological issues.
No specific medications or vaccines exist; treatment is supportive, such as intravenous fluids and respiratory support.
Children, older adults, and immunocompromised individuals are at highest risk for severe illness.

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