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.

Click below to report: 

      A Dead Bird       Mosquito Breeding      A Green Swimming Pool


In the News

West Nile Virus Update: Number of Suspected Cases Falling 

West Nile Virus Update: No New Human Deaths; Bird Numbers Still Rising

West Nile Virus Update: 30 Cases, Five Deaths

West Nile Virus Deaths Increase to Four

West Nile Virus Update: Six More County Residents Test Positive

Second Death Due to West Nile Virus Confirmed

A New Mosquito in San Diego?

Prevent, Protect, Report

West Nile Virus Update: State Confirms New Cases

New Invader: Asian Tiger Mosquito Found in County

State of California WNV webpage

Two Probable Human West Nile Virus Cases Reported

First 2015 Human West Nile Virus Case Reported in County

Current West Nile virus Statistics

Number of Birds Infected with West Nile Virus Tops 2014

More West Nile Virus Infected Mosquitoes Found

Numbers of Dead Birds Testing Positive for West Nile Virus Rising

Fighting the Bite from the Air


Programs & Services                        

General Information         


Report Green Swimming Pools Frequently Asked Questions
Report Mosquito Breeding Clinical Information
Mosquito Fish Distribution Locations Horse Information
Vector Habitat Remediation Program 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 "Go Blue, Not Green!" Video
Request Educational Materials "Stop West Nile Virus" Video Part 1
Request a Presentation "Stop West Nile Virus" Video Part 2
SD Swat Team Kid's Page - NEW GAMES "Local WNV Survivor Story"
Geocaching "Lucha Contra la Picadura del Zancudo" Video
QR Codes "WNV Prevention" PSA (New!)
  "WNV Protection" PSA (New!)
Team Fight the Bite Geocaches

"WNV Reporting" PSA (New!)

"WNV - Prevent, Protect, Report" Video (New!)



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For More Information On 
WNV Or Other Vectors Contact: 
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SD Fight the Bite Homepage