The Virus

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West Nile Virus (WNV) has emerged in recent years in temperate regions of Europe and North America, presenting a threat to public and animal health. The most serious manifestation of WNV infection is fatal encephalitis (inflammation of the brain) in humans and horses, as well as mortality in certain domestic and wild birds. Adults over age 50 tend to be at higher risk for severe illness from WNV infection.

What are the Symptoms?

  • West Nile Virus does not impact most people. Even if they are bitten by an infected mosquito, the majority of people (approximately 80%) who become infected with the virus will not have any symptoms.
  • About 20% of people who get infected will develop mild or moderate flu-like symptoms including:
  • headache
  • fever
  • bodyache
  • swollen glands
  • muscle weakness
  • Less than 1% of those who are infected will experience more severe symptoms, including high fever, neck stiffness, and possibly encephalitis or meningitis.
  • Severe cases of the virus may also lead to muscle weakness, paralysis, coma, or death.

If you have questions about symptoms, contact your health care provider. 

Information regarding the diagnostic criteria for clinicians is available from the CDC.

 

 

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