2015 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 Collected City Cross Streets Species
1 6/15/15 Oakley E. Summer Lakes Dr. x E. Cypress Rd. Culex tarsalis
2 6/15/15 Oakley Oakley Rd. x Main St. Culex tarsalis
3 8/17/15 Martinez Mococo Rd. x Marina Vista Ave. Culex tarsalis
4 9/14/15 Discovery Bay Cherry Hills Dr. Culex tarsalis
5 9/21/15 Discovery Bay Byron Tract NW Culex tarsalis
6 9/21/15 Antioch 8th St. x A St. Culex tarsalis
7 10/2/15 Pittsburg Golf Club Rd. x Leland Rd. Culex tarsalis
8 10/12/15 Martinez Mococo Rd. x Marina Vista Ave. Culex tarsalis

Dead Birds: 11

n Date Reported City Cross Streets Species
1 7/14/15 Oakley Neroly Rd. x Oakley Rd. American Crow
2 7/23/15 Danville Roan Dr. x Clydesdale Dr. American Crow
3 8/9/15 Pleasant Hill Chilpancingo Pky x Camelback Rd. Steller's Jay
4 8/21/15 Concord Peach Pl. x Oak Grove Rd. American Crow
5 8/31/15 Walnut Creek Lilac Dr. x Newell Ave. American Crow
6 9/1/15 Pittsburg Buchanan Rd. x Loveridge Rd. American Crow
7 9/3/15 Brentwood Lone Tree Way x Jeffery Way American Crow
8 9/9/15 San Ramon Dos Rios Dr. x Bollinger Cyn Rd. American Crow
9 9/27/15 Danville Podva Rd. x San Ramon Valley Blvd. Western Scrub Jay
10 10/5/15 Danville Silver Lake Dr. x El Capitan Dr. American Crow
11 10/13/15 Danville Everett Dr. x Paraiso Dr. American Crow

Sentinel Chicken Flocks: 3

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 7/13/15 Holland Tract
4/10 7/27/15 Holland Tract
1/10 8/24/15 Oakley
1/10 8/24/15 Holland Tract
5/10 9/8/15 Oakley
1/10 9/8/15 Holland Tract
2/10 9/21/15 Oakley
1/10 10/5/15 Martinez
1/10 10/19/15 Martinez

Horses: 1

n Date Reported City Dead/Euthanized
1 9/17/15 Brentwood No
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