West Nile Virus: Symptoms & Signs

Most people infected with the West Nile virus do not develop an illness or any symptoms from the infection. However, an illness with fever occurs in about one out of every five people who become infected. The illness produces flu-like symptoms, including

Rarely, in less than 1% of people who are infected, a serious illness with neurological complications develops. These people may develop inflammation of the brain (encephalitis) or the membranes surrounding the brain and spinal cord (meningitis). In this case, symptoms like high fever, stiff neck, disorientation, coma, tremors, seizures (convulsions), or paralysis can occur. Other possible symptoms of severe West Nile virus illness can include difficulty walking and sleepiness. Long-term persistent effects of the severe illness can cause

Causes of West Nile virus

The West Nile virus is a type of arbovirus ("arbo" comes from ARrthropod-BOrne). It is a member of the Flavivirus genus and the family Flaviviridae. People get the infection from a bite from an infected mosquito.

Related Symptoms & Signs

Other west nile virus symptoms and signs

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Medically Reviewed on 9/10/2019
References
United States. Centers for Disease Control and Prevention. "West Nile Virus." Feb. 12, 2015. <http://www.cdc.gov/westnile/symptoms/>.
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