CONCORD, CALIFORNIA – – The Contra Costa Mosquito & Vector Control District’s adult mosquito fogging efforts Tuesday evening in Concord are confirmed successful today. Routine mosquito traps placed after the fogging to test efficacy collected no mosquitoes which means that the mosquito population was reduced to below a detectable level in the targeted area. However, mosquito populations and virus detection remain high in eastern Contra Costa County, specifically in Discovery Bay. Mosquitoes there tested positive this week for West Nile virus. Adult mosquito fogging is set for Monday night.
Today, the Contra Costa Mosquito & Vector Control District is confirming six more groups of mosquitoes and four more chickens that have tested positive for the virus. All 2014 West Nile virus activity and locations can be found on the District’s website.
Throughout California, West Nile virus activity continues to be intense. This week, 36 new human cases were reported from 10 different counties. The total number of confirmed human cases to date is 93 including four fatalities. In 2013, at this same time there were 59 reported cases. The state updates current information Friday afternoon.
“We are happy to report that our fogging efforts in Concord were successful this week. We didn’t have a lot of mosquitoes, but the ones we found were infected with West Nile virus and capable of infecting people,” said Craig Downs, general manager for the District. “Discovery Bay on the other hand has a large mosquito population and some of those mosquitoes are infected. I can’t stress enough the importance of wearing mosquito repellent no matter where you are in the county,” he said.
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 against mosquitoes by 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 www.ContraCostaMosquito.com. Anonymous calls accepted. Just one neglected pool 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. All reports are crucial, even if the bird does not meet criteria for testing.
Since 2005, 48 people in Contra Costa County have been diagnosed with West Nile virus. In 2006, two people died from the disease. Recent studies have shown that the majority of cases are not diagnosed and are grossly underreported. For 2014, a total of 16 groups of mosquitoes, 12 chickens and 26 dead birds have tested positive for the virus.
Visit the District’s website or click on these links for current West Nile virus activity or to receive automatic emails for when the District fogs for adult mosquitoes.
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.
Mosquito Samples: 16
|n||Date Reported||City||Cross Streets||Species|
|1||6/23/14||Knightsen||Holland Tract Area||Culex tarsalis|
|2||7/7/14||Discovery Bay||Cherry Hills Drive||Culex pipiens|
|3||7/7/14||Martinez||I-680 x Waterfront Road||Culex tarsalis|
|4||7/14/14||Discovery Bay||Cherry Hills Drive x Marina Road||Culex pipiens|
|5||7/16/14||Discovery Bay||Bixler road x Balfour Road||Culex pipiens|
|6||7/17/14||Discovery Bay||Cherry Hills Drive x Wayfarer Drive||Culex tarsalis|
|7||7/23/14||Discovery Bay||Byron Tract Levee||Culex tarsalis|
|8||8/6/14||Discovery Bay||Point of Timber Road x Bixler Road||Culex pipiens|
|9||8/12/14||Discovery Bay||Highway 4 x Western Farms Ranch Road||Culex pipiens|
|10||8/13/14||Concord||David Avenue x Cayce Court||Culex tarsalis|
|11||8/19/14||Discovery Bay||Byron Tract SE||Culex pipiens|
|12||8/19/14||Discovery Bay||Byron Tract NW||Culex pipiens|
|13||8/19/14||Discovery Bay||Byron Tract NW||Culex tarsalis|
|14||8/19/14||Discovery Bay||Byron Tract NW||Culex tarsalis|
|15||8/20/14||Discovery Bay||Bixler Road x Point of Timber Road||Culex pipiens|
|16||8/18/14||Discovery Bay||Cherry Hills Drive||Culex pipiens|
Dead Birds: 29
|n||Date Reported||City||Cross Streets||Species|
|1||4/23/14||Alamo||Danville Blvd. x Camille Ave.||American Crow|
|2||5/18/14||Pleasant Hill||Monument Blvd. x Mohr Ln.||American Crow|
|3||6/9/14||San Ramon||Norris Canyon Rd. x Bollinger Canyon Rd.||American Crow|
|4||614/14||Oakley||Empire Ave. x Main St.||American Crow|
|5||6/17/14||Oakley||Empire Ave. x Hemlock Dr.||American Crow|
|6||6/17/14||Oakley||Empire Ave. x Hemlock Dr.||American Crow|
|7||6/20/14||Brentwood||Lone Tree Wy x O’Hara Ave.||American Crow|
|8||6/25/14||Antioch||Hillcrest Ave. x Sunset. Dr.||American Crow|
|9||6/26/14||San Ramon||Bollinger Canyon Rd. x Norris Canyon Rd.||American Crow|
|10||7/2/14||Bethel Island||Bethel Island Rd. x Gateway Rd.||American Crow|
|11||7/9/14||Walnut Creek||Arroyo Wy. x N. Broadway||American Crow|
|12||7/10/14||Oakley||Kay Ave. x O’Hara Ave.||Western Scrub Jay|
|13||7/13/14||Antioch||Camby Rd. x G St.||Western Scrub Jay|
|14||7/14/14||Brentwood||Foothill Dr. x Balfour Rd.||American Crow|
|15||7/16/14||Danville||Hartford Rd. x Danville Blvd.||American Crow|
|16||7/17/14||Antioch||Hargrove St. x E. 18th St.||American Crow|
|17||7/17/14||Brentwood||Minnesota Ave. x Windmeadows Dr.||Western Scrub Jay|
|18||7/21/14||Antioch||Judsonville Dr. x Hansen Dr.||Western Scrub Jay|
|19||7/23/14||Concord||Bancroft Rd. x Hookston Rd.||Western Scrub Jay|
|20||7/29/14||Pinole||Mann Drive X Appian Way||Western Scrub Jay|
|21||8/6/14||Concord||Ryan Road x Wilmore Avenue||American Crow|
|22||8/6/14||Alamo||Stone Valley Road x Roundhill Road||American Crow|
|23||8/7/14||Danville||Montcrest Place x Love Lane||Western Scrub Jay|
|24||8/7/14||Discovery Bay||Cherry Hills Dr. x Wayfarer Dr.||American Crow|
|25||8/10/14||Concord||David Ave. x Getoun Dr.||American Crow|
|26||8/11/14||Brentwood||Burghley Ln. x Centennial Dr.||American Crow|
|27||8/20/14||Concord||Treat Blvd. x San Simeon Dr.||American Crow|
|28||8/21/14||Walnut Creek||Oak Rd. x Jones Rd.||American Crow|
|29||8/21/14||Concord||Whitman Rd. x W Gilardy Dr.||American Crow|
Sentinel Chicken Flocks: 3 (12 chickens)
Note: Chickens do not die from West Nile virus. They develop antibodies to the virus which is detected in their blood.
|# of Chickens out of 10 (10 per Flock)||Date Bled||Area|