2017 West Nile Virus Activity

 

This map details mosquitoes, dead birds, chickens, and horses that have tested positive for West Nile virus. You can zoom in and out of the map and click on the placemarkers to get a detailed description of the date the positive activity was confirmed and the approximate location.

For information regarding human cases, please click here.

Mosquito Samples: 8

n Date Reported City Cross Streets Species
1 7/26/17 DIscovery Bay Point of TImber Rd. x Poe Dr. Culex pipiens
2 8/2/17 Byron Byron Hwy x Rankin Rd. Culex tarsalis
3 8/16/17 Antioch E. 18th St. x Hillcrest Ave. Culex tarsalis
4 8/21/17 Discovery Bay Cherry Hills Dr. x Hwy 4 Culex pipiens
5 8/23/17 Brentwood Continente Ave x Date Nut St. Culex pipiens
6 9/11/17 Oakley Oakley Rd. x Main St. Culex tarsalis
7 9/27/17 Knightsen Holland Tract Rd. x Tranquility Bay Rd. Culex tarsalis
8 10/2/17 Knightsen Holland Tract Rd. x Tranquility Bay Rd. Culex tarsalis

Dead Birds: 18

n Date Reported City Cross Streets Species
1 7/26/2017 Walnut Creek Ygnacio Valley Rd. x Wiget Ln. American Crow
2 7/26/2017 Walnut Creek Ygnacio Valley Rd. x Wiget Ln. American Crow
3 8/1/2017 Walnut Creek Ygnacio Valley Rd. x Wiget Ln. American Crow
4 8/3/2017 Danville Brookside Dr. x Greenbrook Dr. American Crow
5 8/8/2017 Discovery Bay Highway 4 x Discovery Bay Blvd. Western Scrub Jay
6 8/24/2017 Danville Camino Tassajara x Fairwood Ct. Western Scrub Jay
7 9/7/2017 San Ramon Davona Dr. x Calais Drive American Crow
8 9/8/2017 Brentwood Byron Hwy. x Delta Rd. American Crow
9 9/10/2017 Antioch Hillcrest Ave. x Via Dora Dr. American Crow
10 9/12/2017 Pleasant Hill Gregory Ln. x Contra Costa Blvd. American Crow
11 9/18/2017 Alamo Golden Meadow Ln. x Red Wing Dr. Western Scrub Jay
12 9/21/2017 Walnut Creek Arbolado Dr. x Doncaster Dr. American Crow
13 9/24/2017 Walnut Creek Norris Rd. x San Miguel Dr.

American Crow

14 9/27/2017 Pleasant hill Viking Dr. x Norse Dr. American Crow
15 9/27/2017 Martinez Lester Rd. x Milden Rd. Western Scrub Jay
16 9/27/2017 Walnut Creek N. California Blvd. x Pringle Ave. Western Scrub Jay
17 10/1/2017 Walnut Creek Palmer Rd. x Rudgear Rd. American Crow
18 10/2/2017 Martinez Alhambra 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.

#/10 Date Bleed Area
4/10 8/7/17 Knightsen
1/10 9/18/17 Martinez
1/10 10/2/17 Knightsen
1/10 10/2/17 Martinez

Horses: 1

n Date Reported City Dead/Euthanized
1 8/11/2017 Brentwood No
 
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