Powassan encephalitis

Powassan encephalitis, caused by the Powassan virus (POWV), a flavivirus also known as the deer tick virus, is a form of arbovirus infection that results from tick bites. It can occur as a co-infection with Lyme disease, as both are transmitted to humans by the same species of tick.[1] Over the last decade, there has been a surge in the number of cases and an expansion of its geographic range. In the United States, cases have been documented primarily in the northeast.[2] The disease was first isolated from the brain of a boy who died of encephalitis in Powassan, Ontario, in 1958.[3] This disease is classified as a zoonosis, originating in animals, often found in rodents and ticks, with subsequent transmission to humans. The virus shares antigenic similarities with the Far Eastern tick-borne encephalitis viruses.[4]

Main article: Tick-borne meningoencephalitis
Powassan encephalitis
SpecialtyInfectious diseases Edit this on Wikidata

Presentation

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

Diagnosis

Treatment

There is currently no established treatment.[5]

Prognosis

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

References
  1. Caulfield, AJ; Pritt, BS (December 2015). "Lyme Disease Coinfections in the United States". Clinics in Laboratory Medicine. 35 (4): 827–46. doi:10.1016/j.cll.2015.07.006. PMID 26593260.
  2. "Cumulative human disease cases reported to CDC ArboNET for 2015". United States Geological Survey. Archived from the original on 2016-12-15. Retrieved 2015-11-27.
  3. McLEAN, DM; DONOHUE, WL (1 May 1959). "Powassan virus: isolation of virus from a fatal case of encephalitis". Canadian Medical Association Journal. 80 (9): 708–11. PMC 1830849. PMID 13652010.
  4. CASALS, J (13 February 1960). "Antigenic relationship between Powassan and Russian spring-summer encephalitis viruses". Canadian Medical Association Journal. 82: 355–8. PMC 1937779. PMID 13808112.
  5. 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.


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