Contra Costa Mosquito & Vector Control

FOR IMMEDIATE RELEASE     -     October 11, 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 reported another bird that has tested positive for West Nile virus bringing the total number of birds and groups of mosquitoes this year to 37 and six. In addition, Contra Costa Health Services posted on their website that a 65 year-old woman from East County is infected with the disease and is recovering. The recent bird was collected in Concord near San Jose Avenue and Clayton Road.


"Our technicians are busy scouring the known areas where infection is taking place and working to eliminate those sources of larval mosquitoes; however, West Nile virus is endemic throughout the county," said Deborah Bass, public affairs manager for the District. "Many high-producing mosquito sources are in residents' yards, areas we can't access. Flower pot saucers, for example, can produce hundreds of mosquitoes----and neglected swimming pools, even partially filled, can produce more than 1 million mosquitoes and affect people up to five miles away."  

"Dumping water out and maintaining swimming pools would go a very long way in the fight against mosquitoes and the diseases they transmit," Bass stated.

The state's West Nile Virus website now lists a total of four people who have died this year from the virus. Two were from Kern County and two were from Los Angeles county.

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 urged to help reduce their risk of contracting mosquito-borne diseases 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, 39 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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