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West Nile Virus

About the Virus, the Disease, and Its Spread

West Nile virus is spread by the bite of an infected mosquito. The virus can infect people, horses, many types of birds, and some other animals.

Most people who become infected with West Nile virus will have either no symptoms or only mild ones. However, on rare occasions, West Nile virus infection can result in severe and sometimes fatal illnesses.

There is no evidence to suggest that West Nile virus can be spread from person to person or from animal to person.

See the Overview of West Nile Virus section of our Questions and Answers pages and the Background page for details.

|| West Nile Virus CDC Brochure