Home Contra Costa County More West Nile Virus Detected in Knightsen, Martinez and Walnut Creek

More West Nile Virus Detected in Knightsen, Martinez and Walnut Creek

by ECT
CONCORD, CALIFORNIA – – The Contra Costa Mosquito & Vector Control District is reporting two more dead birds, two more chickens, and another group of mosquitoes have tested positive for the virus.
The mosquitoes and one chicken were from an area near Knightsen and another chicken was from Martinez. The dead birds were collected from Martinez and Walnut Creek.
For a list of all 2017 West Nile virus activity and locations, visit the District’s website.
“The cooler weather is arriving, which is good news,” said Deborah Bass, public affairs manager. “That slows down mosquito production as well as the virus.” 
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.

Mosquito Samples: 8

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
810/2/17KnightsenHolland Tract Rd. x Tranquility Bay Rd.Culex tarsalis

Dead Birds: 18

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
1710/1/2017Walnut CreekPalmer Rd. x Rudgear Rd.American Crow
1810/2/2017MartinezAlhambra Valley Rd. x Chelsea Dr.American Crow

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
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.
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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