West Nile virus is a serious illness spread by the bite of an infected mosquito. Mosquitoes become infected after feeding on infected birds, then can spread the virus to people and other animals. Since 1999, West Nile virus has been found every summer in the U.S., including in all lower 48 states. 

In Clark County, the first human and mosquito cases were reported in 2004. Since then, the virus has been regularly detected in mosquito populations, and human cases reported in most seasons. West Nile virus is now considered endemic in Clark County during mosquito season (April to November), meaning we expect to see it each year. 

The best way to protect yourself is to avoid mosquito bites. You can help by reporting stagnant water, green swimming pools or other mosquito breeding areas to your local code enforcement agency. 

For more information, visit the Mosquito Surveillance page or the Nevada Department of Agriculture’s website.

Reports

Other Clark County Mosquito-borne Illnesses

• St. Louis Encephalitis
• Western Equine Encephalitis

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