Discovery Bay: Two Groups of Mosquito’s Confirmed to Have West Nile Virus

CONCORD, CALIFORNIA – – The Contra Costa Mosquito & Vector Control District confirmed today that two groups of mosquitoes and one dead bird tested positive for West Nile virus. The mosquitoes were trapped in and near Bethel Island and Discovery Bay. The dead bird was from Concord.
“The risk of getting West Nile virus is elevated when it’s found in mosquitoes,” said Steve Schutz, Ph.D., scientific program manager with the District. “Mosquitoes can transmit the disease through a simple bite–and it only takes one. It’s more important than ever to wear mosquito repellent and avoid mosquito bites.”
Fogging for adult mosquitoes is scheduled for this evening, Thursday, September 1 in the Bethel Island / North East Oakley area.

Mosquito Samples: 6

n Date Reported City Cross Streets Species
1 7/11/16 Knightsen Holland Tract Area Cx tarsalis
2 7/18/16 Antioch Cavallo Ave x Wilbur Ave Cx tarsalis
3 8/1/16 Byron Holland Tract Area Cx tarsalis
4 8/1/16 Byron Byron Hwy x Rankin Rd Cx tarsalis
5 8/29/16 Bethel Island Stone Rd Cx tarsalis
6 8/29/16 Discovery Bay Byron Tract NW Cx tarsalis

Dead Birds: 18

n Date Reported City Cross Streets Species
1 6/13/16 Antioch Prewett Ranch Dr x Mokelumne Dr American Crow
2 7/11/16 Brentwood Eden Plains Rd x Chestnut St Western Scrub Jay
3 7/12/16 Antioch Marigold Wy x Prewett Ranch Dr American Crow
4 7/13/16 Brentwood Oak St x 2nd St American Crow
5 7/25/16 Oakley Oakley Rd x Trenton St American Crow
6 7/31/16 Blackhawk Deer Meadow Dr x Live Oak Dr American Crow
7 8/1/16 Oakley Big Bear Rd x Bernard Rd Western Scrub Jay
8 8/4/16 Alamo Stone Valley Rd x Alamo Glen Dr American Crow
9 8/7/16 Alamo Camino Sobrante x Orinda Wy American Crow
10 8/8/16 Brentwood Balfour Rd x Fairview Ave American Crow
11 8/9/16 Concord Glazier Dr x Armand Dr American Crow
12 8/9/16 Antioch Lone Tree Wy x Deer Valley Rd Western Scrub Jay
13 8/18/16 Pleasant Hill Geary Rd x Pleasant Hill Rd American Crow
14 8/19/16 Oakley Lakespring Dr x Beaulieu Ln Western Scrub Jay
15 8/23/16 Danville Verona Ave x Love Ln American Crow
16 8/24/16 Concord Treat Blvd x Oak Grove Rd American Crow
17 8/25/16 Concord Michigan Blvd x Washington Blvd American Crow
18 8/30/16 Concord Treat Blvd x Oak Grove Rd 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.

#/10 Date Bleed Area
#2/10 7/18/16 Oakley
#1/10 8/1/16 Holland Tract
#2/10 8/15/16 Holland Tract


Visit the District’s website to learn of all West Nile virus activity in Contra Costa County this year, or to receive automatic adult mosquito fogging notifications should they be scheduled.
Residents are urged to help 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: 1-877-968-2473 or by visiting the California Department of Public Health’s website. All reports are crucial.

Since 2005, 55 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.


  1. West Nile Virus and Toxic waterways in Discovery Bay. Live where you pay but don’t touch birds or go in the water. They need to declare a state of emergency to get federal funds before people move out.

  2. Steve, nice try you jealous little bitch. You post was mildly amusing only for the fact that it reeked of envy. Maybe someday you might be able to afford a home in Discovery Bay. For now though, concentrate on reading an entire story, not just the headline. Dumbass.

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