Mosquito fogging in response to dead bird found in Clay Park

South San Francisco, CA  August 20, 2014  

A dead house finch found up at Clay Park in West Winston Manor on August 14th has tested positive for West Niles Virus along with the pool of water and mosquitoes in the park . The San Mateo County Mosquito and Vector Control District has been very aggressive in monitoring and treating this threat through out the county. In response to this recent find in South City  Mosquito fogging will take place this Thursday August 21 between 9pm and 5am. The area to be treated is within El Camino Real on the east, Callan on the west, San Felipe  on the south and Collins on the north, with Clay Park in the center. ‘The District will conduct truck-mounted mosquito fogging treatment around the detection site, in an effort to prevent human cases of WNV.’

See the map below for areas to be fogged.  CLICK HERE to report dead birds in your area. To date there have been 8 confirmed cases of dead birds that have tested positive for West Niles Virus, thanks in part to those who have made reports.


From the County Website:

Residents with questions can call the District at (650) 344-8592 Monday through Friday from 8:00 AM to 4:30 PM.
Mosquitoes will be collected in the area after the fogging is complete. If post-treatment mosquito samples are carrying West Nile Virus, the district may fog the area again.
West Nile Virus is transmitted through the bite of an infected mosquito. The primary hosts are birds. Humans, horses and other animals can become infected with WNV if bitten by an infected mosquito. It cannot be spread person to person.
Reports of dead birds are an early indication that the virus is circulating in the environment. Residents are encouraged to help by reporting fresh carcasses of birds or tree squirrels to the West Nile virus hotline, online at or by phone at 877-WNV-BIRD (877-968-2473).
To prevent mosquito breeding on your property and to prevent mosquito bites, follow the “Three D’s”:
 DRAIN – Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property, including flower pots, old car tires, rain gutters and pet bowls.
 DAWN and DUSK – Mosquitoes bite in the early morning and evening so it is important to wear proper clothing and repellent if outside during these times. Make sure that your doors and windows have tight-fitting screens to keep mosquitoes out.
 DEET– Apply insect repellent containing DEET, picaradin, oil of lemon eucalyptus or IR3535 according to label instructions. Repellents keep the mosquitoes from biting you.
For assistance with a mosquito problem in San Mateo County, contact the District at (650) 344-8592.
For more information on West Nile Virus and other district services, visit us on the web at:


Fogging map August 21-page-001

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Cynthia Marcopulos
Cynthia Marcopulos
7 years ago

I just called the department, and the young lady stated it will kill the adult mosquito and the bees– I told her we have been seeing dying bumblebees in this area for awhile. So, she said they will be dragging the fogger behind a truck and spraying the street and it will travel into the backyards. I asked her if this has been tested on domestic animals for safety, and she could not answer. Waiting for Ms. Stevenson to call back and will give an update.