West Nile virus (WNV) is most commonly transmitted to humans by mosquitoes. You can reduce your risk of being infected with WNV by using insect repellent and wearing protective clothing to prevent mosquito bites. There are no medications to treat or vaccines to prevent WNV infection. Fortunately, most people infected with WNV will have no symptoms. About 1 in 5 people who are infected will develop a fever with other symptoms. Less than 1% of infected people develop a serious, sometimes fatal, neurologic illness.
News & Highlights
- Get the Facts: West Nile Virus: Protect yourself and your family from getting sick this summer. [PDF – 2 pages]
- West Nile Virus and Other Nationally Notifiable Arboviral Diseases — United States, 2015
- Final maps and data, 1999-2015
- Monitoring and Controlling West Nile Virus: Are Your Prevention Practices in Place? [PDF – 732KB]
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WNV Activity & Surveillance
- Page last reviewed: February 12, 2015
- Page last updated: July 20, 2017
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