Powassan Virus Encephalitis

Viral Diseases

Animals Involved

Rodents (groundhog, squirrels, mice) and other small mammals thought to be reservoirs

Known Distributions

North America, eastern Russia

Probable Means of Spreading

Ixodes spp ticks, also found in Dermacentor andersoni

Clinical Manifestations in People

Nonspecific febrile illness; may progress to neurologic signs, which may be severe; some cases fatal

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