2012 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: 19
| n | Date Collected | City | Cross Streets | Species |
|---|---|---|---|---|
| 1 | 7/10 | Brentwood | Garin Pkwy x Spruce St. | tarsalis |
| 2 | 7/10 | Brentwood | Chestnut St. x Sellers Ave. | pipiens |
| 3 | 7/16 | Brentwood | Chestnut St. x Sellers Ave. | pipiens |
| 4 | 7/23 | Brentwood | Garin Pkwy x Spruce St. | pipiens |
| 5 | 7/26 | Brentwood | Garin Pkwy x Spruce St. | pipiens |
| 6 | 8/1 | Brentwood | Garin Pkwy x Spruce St. | pipiens |
| 7 | 8/6 | Antioch | Cavallo Rd. x Wilbur Ave. | tarsalis |
| 8 | 8/15 | Brentwood | Chestnut St. x Sellers Ave. | pipiens |
| 9 | 8/20 | Brentwood | Waldon St. x Balfour Rd. | tarsalis |
| 10 | 8/22 | Brentwood | Sellers Ave. x Redhaven St. | pipiens |
| 11 | 8/20 | Knightsen | Holland Tract | tarsalis |
| 12 | 8/29 | Knightsen | Holland Tract | tarsalis |
| 13 | 8/29 | Discovery Bay | Newport Dr. x Hwy 4 | tarsalis |
| 14 | 8/27 | Byron | Byron Hwy x Byron Hot Springs Rd. | tarsalis |
| 15 | 9/4 | Antioch | Wilbur Ave. x Marie Ave. | pipiens |
| 16 | 9/10 | Brentwood | Garin Pkwy x Spruce St. | pipiens |
| 17 | 9/10 | 8th St. x H St. | 8th St. x H St. | pipiens |
| 18 | 9/19 | Brentwood | Balfour Rd. x Sellers Ave. | tarsalis |
| 19 | 9/19 | Brentwood | Balfour Rd. x Sellers Ave. | pipiens |
Dead Birds: 66
| n | Date Reported | City | Cross Streets | Species |
|---|---|---|---|---|
| 1 | 4/9 | Pleasant Hill | Ellinwood Wy x Contra Costa Blvd. | Stellar's Jay |
| 2 | 6/8 | Walnut Creek | Geary Rd. x Buena Vista Ave. | American Crow |
| 3 | 7/2 | Brentwood | Balfour Rd. x Walnut Blvd. | American Crow |
| 4 | 7/5 | Pleasant Hill | Doray Dr. x Contra Costa Blvd. | American Crow |
| 5 | 7/16 | Pleasant Hill | Viking Dr. x Contra Costa Blvd. | American Crow |
| 6 | 7/16 | Knightsen | Sunset Rd. x Eden Plains Rd. | American Crow |
| 7 | 7/16 | Walnut Creek | Hutchinson Rd. x Walnut Ave. | American Crow |
| 8 | 7/25 | Knightsen | Sunset Rd. x Eden Plains Rd. | American Crow |
| 9 | 7/28 | El Sobrante | Valley View Rd. x San Pablo Dam Rd. | Western Scrub Jay |
| 10 | 8/2 | Oakley | Sandmound Blvd. x Bethel Island Road | American Crow |
| 11 | 8/7 | Discovery Bay | Discovery Bay Blvd. x Willow Lake Rd. | American Crow |
| 12 | 7/25 | Martinez | Pine St. x Pacheco Blvd. | Western Scrub Jay |
| 13 | 8/8 | Knightsen | Sunset Rd. x Byron Hwy | American Crow |
| 14 | 8/9 | Brentwood | Walnut Blvd. x Balfour Blvd. | Western Scrub Jay |
| 15 | 8/16 | Pleasant Hill | Boyd Rd. x Pleasant Hill Rd. | American Crow |
| 16 | 8/20 | Brentwood | Twilight Ct. x Sunset Rd. | American Crow |
| 17 | 8/20 | Brentwood | Shirley St. x Brentwood Blvd. | American Crow |
| 18 | 8/20 | Antioch | Montara Dr. x Country Hills Dr. | American Crow |
| 19 | 8/21 | Brentwood | Fairview Ave. x Central Blvd. | Western Scrub Jay |
| 20 | 8/21 | Brentwood | Cypress Rd. x Sellers Ave. | American Crow |
| 21 | 8/22 | Walnut Creek | 1st Ave. x Buena Vista Ave. | American Crow |
| 22 | 8/22 | Antioch | Worrel Rd. x Lone Tree Wy | Western Scrub Jay |
| 23 | 8/23 | Oakley | O'Hara Ave. x W. Cypress Rd. | American Crow |
| 24 | 8/26 | Discovery Bay | Newport Dr. x Clipper Dr. | American Crow |
| 25 | 8/28 | Concord | Concord Blvd. x West St. | American Crow |
| 26 | 8/28 | Walnut Creek | 1st Ave. x Larkey Ln. | American Crow |
| 27 | 8/28 | Clayton | Morgan Territory Rd. x Marsh Creek Rd. | Western Scrub Jay |
| 28 | 8/29 | Brentwood | John Muir Pkwy x Ventura Dr. | American Crow |
| 29 | 8/29 | Brentwood | Wildberry Dr. x Valley Green Dr. | American Crow |
| 30 | 8/29 | Antioch | Lone Tree Way x Dallas Ranch Rd. | American Crow |
| 31 | 9/4 | San Ramon | Sunnybrook Pl. x Yosemite Ave. | Western Scrub Jay |
| 32 | 8/27 | Concord | Mendocino Dr. x Clayton Rd. | Western Scrub Jay |
| 33 | 8/27 | Brentwood | Fairview Ave. x Sand Creek Rd. | Western Scrub Jay |
| 34 | 8/28 | Antioch | Wilbur Ave. x Almond St. | Western Scrub Jay |
| 35 | 9/6 | Concord | Clayton Rd. x East St. | American Crow |
| 36 | 9/7 | Concord | Concord Blvd. x Landana Dr. | American Crow |
| 37 | 9/10 | Concord | Concord Blvd. x Bailey Rd. | American Crow |
| 38 | 9/10 | Brentwood | Sand Creek Rd. x Hwy 4 | American Crow |
| 39 | 9/11 | Brentwood | Central Blvd. x Minnesota Ave. | American Crow |
| 40 | 9/11 | Antioch | Black Oak Way x Eagleridge Dr. | Western Scrub Jay |
| 41 | 9/13 | Pleasant Hill | Patterson Blvd. x Oak Park Blvd. | American Crow |
| 42 | 9/10 | Concord | Bailey Rd. x Concord Blvd. | American Crow |
| 43 | 9/11 | Knightsen | Knightsen Ave. x Delta Rd. | American Crow |
| 44 | 9/18 | Brentwood | Sunset Rd. x Byron Hwy | American Crow |
| 45 | 9/19 | Concord | Concord Blvd. x Bailey Rd. | Western Scrub Jay |
| 46 | 9/20 | Brentwood | Fairview Ave. x Sand Creek Rd. | American Crow |
| 47 | 9/20 | Concord | Risdon Rd. x Getoun Dr. | American Crow |
| 48 | 9/21 | Oakley | Laurel Rd. x O'Hara Ave. | Western Scrub Jay |
| 49 | 9/17 | Concord | Babel Ln. x Clayton Rd. | Western Scrub Jay |
| 50 | 9/25 | Concord | Clayton Rd. x West St. | American Crow |
| 51 | 9/27 | Pleasant Hill | Geary Rd. x Pleasant Hill Rd. | American Crow |
| 52 | 9/28 | Walnut Creek | N. Main St. x San Luis Rd. | American Crow |
| 53 | 10/1 | Concord | Thornwood Dr. x WIlson Ln. | American Crow |
| 54 | 9/19 | Pleasant Hill | Paso Nogal x Morello Ave. | American Crow |
| 55 | 9/21 | Discovery Bay | Discovery Bay Blvd. x Cabrillo Pt. | Western Scrub Jay |
| 56 | 10/2 | Brentwood | Balfour Rd. x Griffith Ln. | American Crow |
| 57 | 10/3 | Brentwood | Shirley St. x Brentwood Blvd. | American Crow |
| 58 | 10/5 | Knightsen | Byron Hwy. x Eagle Ln. | American Crow |
| 59 | 9/26 | Knightsen | Byron Hwy. x Eagle Ln. | American Crow |
| 60 | 9/27 | Concord | Concord Blvd. x N 6th St. | Western Scrub Jay |
| 61 | 9/28 | Oakley | O'Hara Ave. x Laurel Rd. | Western Scrub Jay |
| 62 | 10/8 | Concord | Concord Blvd. x Mendocino Dr. | Western Scrub Jay |
| 63 | 10/12 | Brentwood | Balfour Rd. x Sellers Ave. | American Crow |
| 64 | 10/11 | Discovery Bay | Discovery Bay Blvd. x Riverlake Rd. | American Crow |
| 65 | 10/3 | Oakley | Laurel Rd. x O'Hara Ave. | Western Scrub Jay |
| 66 | 10/5 | Walnut Creek | San Luis Rd. x Larkey Ln. | Western Scrub Jay |
Sentinel Chicken Flocks: 2
| #/10 | Date Bleed | Area |
|---|---|---|
| 3/10 | 8/13 | Holland Tract |
| 1/10 | 8/27 | Holland Tract |
| 2/10 | 9/10 | Holland Tract |
| 1/10 | 9/24 | Oakley |
Note: Chickens do not die from West Nile virus. They develop antibodies to the virus which is detected in their blood.
Horses: 0
| n | Date Reported | City | Dead/Euthanized |
|---|---|---|---|
| 1 | 9/17/15 | Brentwood | No |