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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.

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Frequently Asked Questions

Answers to common questions

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Prevention & Control

How to avoid infection with West Nile virus

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Symptoms & Treatment

Signs and symptoms of West Nile virus disease

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Transmission

How West Nile virus is transmitted

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Statistics & Maps

Surveillance data and maps

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For Health Care Providers

Information about clinical presentation, diagnostic testing, treatment, and prevention

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For Vector Control Professionals

Information about mosquito control

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Resources

Guidelines and publications

 
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