Contra Costa Mosquito & Vector Control

FOR IMMEDIATE RELEASE     -     September 20, 2011

Contact: Deborah Bass
              Public Affairs Mgr.

(925) 771-6112 - office
(925) 260-4670 - mobile 



CONCORD, CALIFORNIA - - The Contra Costa Mosquito and Vector Control District is reporting ten more birds that have tested positive for West Nile virus bringing the total number of birds and groups of mosquitoes this year to 25 and four. One bird was collected from Walnut Creek near Walnut Avenue and Oak Grove Road; two birds were from Pleasant Hill near Ellinwood Drive and Contra Costa Boulevard and Gregory Lane and Contra Costa Boulevard; four from Concord, two near Oak Grove Road and Minert Road, one near David Avenue and Mohr Lane, and one near Northwood Drive and Olivera Road; one from Lafayette near Old Tunnel Road and Pleasant Hill Road; and two from Brentwood, one near Highway 4 Bypass and Balfour Road and one near Main Street and Sycamore Avenue.


"Our surveillance of the area coupled with the public reporting dead birds has enabled us to locate these areas of higher risk of West Nile virus where we can concentrate our mosquito control efforts," said Deborah Bass, public affairs manager for the District. "People need to be smart about being outdoors with mosquitoes - that is, wear mosquito repellent. A mosquito needs only to bite one time to transmit this sometimes debilitating and potentially deadly disease."   

Residents are urged to continue to report dead birds to the West Nile Virus state hotline: 1-877-968-2473. Reports may also be made online at  Dead bird reports are an important tool for West Nile virus detection, even if the bird is not picked up and tested. Lack of dead bird reports decreases the District's ability to detect higher risk locations. 

The District makes every effort to notify residents about West Nile virus activity and adult mosquito spraying events. People wishing to be notified about adult mosquito spraying in residential areas have several options. They may visit the District's website and opt to receive the maps and notifications automatically by email.There is also an option to receive media releases and the Mosquito Bytes newsletter. They can also view all of these communications directly on the District's website. Spray schedules are also available by calling the District at (925) 771-6195 and listening to a recorded message.


Residents are also urged to help reduce their risk by following these guidelines: 

  • Don't breed mosquitoes on your property. Dump or drain standing water. Mosquitoes can't begin their life without water.
  • Defend yourself against mosquitoes using repellents containing DEET, Picaridin, or Oil of Lemon Eucalyptus.
  • Avoid being outdoors when mosquitoes are present, typically Dawn and Dusk.
  • Report neglected swimming pools by calling 925-771-6195 or visiting  Anonymous calls accepted. Just one neglected pool can produce more than 1 million mosquitoes and affect people up to five miles away.  
Since 2005, 36 people in Contra Costa County have been diagnosed with West Nile virus. In 2006, two people died from the disease. Studies have shown that the majority of cases are undiagnosed.

Contra Costa Mosquito & Vector Control District, an independent special district and public health agency, is located at 155 Mason Circle in Concord. Call the District to report mosquito problems at (925) 771-6195 or visit their office between 8:00 a.m. and 4:30 p.m. to get FREE mosquitofish for ornamental ponds, horse troughs or neglected swimming pools.  

For information concerning human West Nile virus symptoms, prevention, or testing, please call the Contra Costa Health Services department at (888) 959-9911. For information concerning West Nile virus and horses, please call the California Department of Food and Agriculture Animal Health Branch at (916) 654-1447. 

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