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West Nile Virus

Published on: 11/21/2013 8:02 AM
West Nile Virus (WNV) is a mosquito-borne disease that was first detected in the West Nile District of Uganda. Transmitted by mosquito bites, WNV affects humans, horses, some birds, and squirrels. The widespread disease is found in Africa, Asia, the Middle East, and North America. In humans, it causes mild to severe flu-like symptoms such as fever, headache, body ache, and in severe cases, significant neurological symptoms or even deaths. The elderly and those with immune system compromise are most susceptible. 
WNV in the United States
In the United States, the first WNV outbreak was reported during 1999 in New York City. The virus spread quickly across the nation during the subsequent 5 years. It was first reported in California during 2002 in Los Angeles and within 2 years, WNV had been confirmed in 58 counties.
Since its arrival here in 2004, Santa Clara County has reported 16 human WNV cases with no fatalities.
What You Should Know 
There is no cure for WNV. Vaccines for humans are not available yet. People can protect themselves from WNV by taking precautions to avoid mosquito bites, and reducing or eliminating standing water on their property. To help us detect WNV activity, we request that you report all dead birds and squirrels directly to the DEAD BIRD HOTLINE at 877-WNV-BIRD (968-2473) or online at
To get help, Santa Clara County residents can sent requests by email or contact the District at: 
Santa Clara County Vector Control District
1580 Berger Drive, San Jose, CA 95112
Phone: (408) 918-4770 / (800) 675-1155
More Information ....
  • Mosquito Information (English)
  • Aerial Pool Surveys (English)
  • Highlights from the California WNV Website (English)
  • Approved Mosquito-borne Virus Reponse & Operation Plan - MVROP (View here)
  • Action Plan for Ground Fogging (View here)
  • Adopted Resolution of the MVROP (View here)