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Environmental Health

West Nile Virus

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West Nile virus (WNV), is a disease transmitted to humans, birds, horses, and other animals, by infected mosquitoes. Mosquitoes get the disease from feeding on infected birds and can later pass it on when they bite animals or humans.

WNV is established in San Diego County and can be found in all 58 counties in California! The virus was first isolated in the West Nile district of a Northern Province in Uganda in 1937. It was first detected in the United States in New York City in 1999. From there, the virus spread westward, arriving in California in 2003. West Nile virus is now the most prevalent mosquito-borne disease in the United States.

Watch WNV Public Service Announcement

Temporary Summer Employment

National "Fight the Bite" Poster Contest

Services	General Information
Report Dead Birds	WNV History
Report Green Swimming Pools	Frequently Asked Questions
Report Mosquito Breeding	Mosquito Information
Mosquito Fish Distribution Locations	Clinical Information
	Horse Information
	EPA Information on Insect Repellents

Education	Media
Educational Materials	WNV Press Releases
Request Brochures	WNV Public Service Announcement
Request Presentation	Watch "Stop West Nile Virus" Video
National "Fight the Bite" Poster Contest	Watch "Local WNV Survivor Story"
Geocaching

WNV Activity Update	Prevention
WNV Cases in San Diego County	How to Protect Yourself
WNV Activity Map	Mosquito Prevention
Aerial Larvicide Application	Green Swimming Pools
	Mosquito Fish