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West Nile Virus (cont.)

West Nile Virus and West Nile Encephalitis Prognosis

The prognosis of West Nile virus is directly related to the severity of the illness and the age of the person with the infection.

  • Those with mild infection recover fully with no permanent disability.
  • Death occurs in about 10%-12% of people with West Nile encephalitis (WNE), but only about one of 150-250 people who are infected will develop WNE. The elderly are at highest risk for death. Younger people recover much more quickly and are much less likely to show signs and symptoms of severe illness. In some patients, symptoms possibly due to WNV persisted up to eight years after infection.
Medically Reviewed by a Doctor on 4/9/2015

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Read What Your Physician is Reading on Medscape

West Nile Encephalitis »

West Nile encephalitis (WNE) is distinguished from other arthropod-borne causes of viral encephalitis (eg, western equine encephalitis, eastern equine encephalitis [EEE], Japanese encephalitis, Venezuelan encephalitis) based on its geographic distribution, clinical features, and laboratory findings.

Read More on Medscape Reference »


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