West Nile Virus


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.

The Vector Control Program protects communities and the environment by controlling mosquitoes that can transmit diseases to humans.

What's New

First 2015 Detection of New Invasive Mosquito

Officials Urge West Nile Virus Vigilance

New Invasive Mosquito Found in County

State Confirms La Mesa Man Died from West Nile Virus

Meet the "Fight the Bite" Mobile App

WNV Survivor "Fights the Bite"!

Fight the Bite App Download

  • The Fight the Bite Mobile App is now available at the San Diego County App Store. The Fight the Bite App is used to anonymously report green swimming pools, mosquito breeding and dead birds for treatment or testing.

SD Swat Team Kid's Page - NEW GAMES

Vector Habitat Remediation Program

State of California WNV webpage


General Information         

Report Dead Birds WNV History
Report Green Swimming Pools Frequently Asked Questions
Report Mosquito Breeding Clinical Information
Mosquito Fish Distribution Locations Horse Information
  EPA Information on Insect Repellents
WNV Activity Updates      Prevention                                       
WNV Cases in San Diego County Mosquito Prevention
Aerial Larvicide Application Green Swimming Pools
  Mosquito Fish




Pamphlet Library Fight The Bite Mobile App Public Service Announcement
Request Educational Materials "Fight the Bite App Takes on West Nile Virus" Video
Request a Presentation "Go Blue, Not Green!" Video
Geocaching "Stop West Nile Virus" Video Part 1
  "Stop West Nile Virus" Video Part 2
  "Local WNV Survivor Story"
  "Lucha Contra la Picadura del Zancudo" Video
Team Fight the Bite Geocaches QR Codes


Other Languages          

Español                  Cambodian
Francais                 Laos
Tagalog                  Chinese
Russian                  Tiêng Viêt  
Português              Somali


For More Information On 
WNV Or Other Vectors Contact: 
(858) 694-2888  
SD Fight the Bite Homepage