Powassan virus cases are surging across the U.S. as tick activity peaks during the summer camp season.
The rise in infections is critical because the virus can turn deadly quickly and currently has no available vaccine or specific medical treatment.
Public health officials report 15 cases so far in 2026 [1]. This follows a record-breaking year in 2025, when the U.S. saw 76 diagnoses [2]. The virus is spreading as tick populations expand northward and activity increases during the warmer months.
Cases have appeared in diverse regions, including the Gull Lake area, and Northern California. In California, only four people have ever been diagnosed with the virus [3].
Recent hospitalizations highlight the risk to older adults. One 66-year-old man from New Hampshire was recently hospitalized after contracting the illness [4]. Dr. Marc Siegel, a senior medical analyst for Fox News, said the dangers associated with the virus are high as the season peaks.
Unlike some other tick-borne illnesses, Powassan can be transmitted to humans very quickly after a bite. This makes immediate tick removal and vigilance essential for those spending time in wooded areas or attending summer camps.
Health officials recommend using insect repellent and performing thorough tick checks on children and adults. Because there is no vaccine, prevention remains the only reliable method to avoid infection.
“Powassan virus cases are surging across the United States as tick activity peaks.”
The record-breaking number of cases in 2025 and the continued surge in 2026 suggest a geographic expansion of the ticks that carry the Powassan virus. Because the disease lacks a vaccine and can progress rapidly, the burden of care shifts entirely to preventative measures and early detection, increasing the public health risk for outdoor recreation and youth camps.
