Home California Mosquitoes, Dead Birds, and a Chicken Test Positive For West Nile Virus

Mosquitoes, Dead Birds, and a Chicken Test Positive For West Nile Virus

by ECT

CONCORD, CALIFORNIA – – The Contra Costa Mosquito & Vector Control District is reporting five dead birds, a group of mosquitoes, and a chicken that have tested positive for West Nile virus. In addition, the District received notice from public health officials that two people, one from East county and one from Central county also tested positive for the virus.

For a list of all 2017 West Nile virus activity and locations, visit the District’s website.

The mosquitoes were collected from an area near Knightsen and the chicken from Martinez. The dead birds were collected from Pleasant Hill, Martinez, and Walnut Creek.

“The West Nile virus season isn’t over yet,” said the District’s Scientific Programs Manager Steve Schutz, Ph.D. “People need to take precautions against mosquito bites. Please take our guidelines seriously.”

District personnel are conducting extra surveillance and mosquito control in the areas where virus activity was found.

Residents can reduce their risk of contracting mosquito-borne diseases by following these guidelines:

  • Dump or drain standing water. Mosquitoes can’t begin their lives without water.
  • Defend yourself – use repellents containing DEET, Picaridin, or Oil of Lemon Eucalyptus.
  • Avoid being outdoors when mosquitoes are present, typically dawn and dusk.
  • Maintain neglected swimming pools. Just one can produce more than 1 million mosquitoes and affect people up to five miles away.

Report dead birds to the state hotline: by visiting the California Department of Public Health’s website. All reports are crucial.

Since 2005, 58 people in Contra Costa County have been diagnosed with West Nile virus. In 2006, two people died from the disease. For a current list of West Nile virus activity this year, visit this page on the District’s website.  For human case information, please contact Contra Costa Health Services at 888-959-9911.

Mosquito Samples: 7

nDate ReportedCityCross StreetsSpecies
17/26/17DIscovery BayPoint of TImber Rd. x Poe Dr.Culex pipiens
28/2/17ByronByron Hwy x Rankin Rd.Culex tarsalis
38/16/17AntiochE. 18th St. x Hillcrest Ave.Culex tarsalis
48/21/17Discovery BayCherry Hills Dr. x Hwy 4Culex pipiens
58/23/17BrentwoodContinente Ave x Date Nut St.Culex pipiens
69/11/17OakleyOakley Rd. x Main St.Culex tarsalis
79/27/17KnightsenHolland Tract Rd. x Tranquility Bay Rd.Culex tarsalis

Dead Birds: 16

nDate ReportedCityCross StreetsSpecies
17/26/2017Walnut CreekYgnacio Valley Rd. x Wiget Ln.American Crow
27/26/2017Walnut CreekYgnacio Valley Rd. x Wiget Ln.American Crow
38/1/2017Walnut CreekYgnacio Valley Rd. x Wiget Ln.American Crow
48/3/2017DanvilleBrookside Dr. x Greenbrook Dr.American Crow
58/8/2017Discovery BayHighway 4 x Discovery Bay Blvd.Western Scrub Jay
68/24/2017DanvilleCamino Tassajara x Fairwood Ct.Western Scrub Jay
79/7/2017San RamonDavona Dr. x Calais DriveAmerican Crow
89/8/2017BrentwoodByron Hwy. x Delta Rd.American Crow
99/10/2017AntiochHillcrest Ave. x Via Dora Dr.American Crow
109/12/2017Pleasant HillGregory Ln. x Contra Costa Blvd.American Crow
119/18/2017AlamoGolden Meadow Ln. x Red Wing Dr.Western Scrub Jay
129/21/2017Walnut CreekArbolado Dr. x Doncaster Dr.American Crow
139/24/2017Walnut CreekNorris Rd. x San Miguel Dr.American Crow
149/27/2017Pleasant hillViking Dr. x Norse Dr.American Crow
159/27/2017MartinezLester Rd. x Milden Rd.Western Scrub Jay
169/27/2017Walnut CreekN. California Blvd. x Pringle Ave.Western Scrub Jay

Sentinel Chicken Flocks: 2

Note: Chickens do not die from West Nile virus. They develop antibodies to the virus which is detected in their blood.

#/10Date BleedArea

Horses: 1

nDate ReportedCityDead/Euthanized


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 the office between 8:00 a.m. and 4:30 p.m. to get FREE mosquitofish for ornamental ponds, horse troughs or neglected swimming pools.

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