Powassan encephalitis

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Powassan encephalitis
Classification and external resources
ICD-10 A84.8

Powassan encephalitis is a form of arbovirus infection that results from tick bites.


Symptoms manifest within 7–10 days and include fever, headache, partial paralysis, confusion, nausea and even coma.


There is currently no established treatment.[1]

Half of all cases results in permanent neurological damage and 10-15% result in death.


  1. ^ Hinten SR, Beckett GA, Gensheimer KF et al. (December 2008). "Increased recognition of Powassan encephalitis in the United States, 1999-2005". Vector Borne Zoonotic Dis. 8 (6): 733–40. doi:10.1089/vbz.2008.0022. PMID 18959500.