2008 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: 30
| n | Date Collected | City | Cross Streets | Species |
|---|---|---|---|---|
| 1 | 6/2 | Knightsen | Holland Tract | tarsalis |
| 2 | 7/3 | Antioch | Peach Tree Circle/Silverado Dr | tarsalis |
| 3 | 7/9 | Antioch | Cavallo Rd/Wilbur Ave | tarsalis |
| 4 | 7/11 | Antioch | Mira Vista Park | tarsalis |
| 5 | 7/11 | Antioch | Rockford/Sandy Hill | tarsalis |
| 6 | 7/16 | Antioch | Peachtree/Silverado | tarsalis |
| 7 | 7/24 | Oakley | Picasso/Vella | tarsalis |
| 8 | 7/25 | Oakley | Sandmound/Cypress | tarsalis |
| 9 | 7/28 | Antioch | Wilbur/Marie | tarsalis |
| 10 | 7/28 | Antioch | 8th/McElheny | tarsalis |
| 11 | 7/31 | Antioch | Rockford/Sandy Hill | tarsalis |
| 12 | 7/31 | Brentwood | Sycamore/Garin | pipiens |
| 13 | 7/31 | Antioch | Cavallo Rd/Wilbur Ave | tarsalis |
| 14 | 7/31 | Antioch | James Donlan/Contra Loma | incidens |
| 15 | 8/14 | Antioch | Marie Ave/Wilbur Ave | pipiens |
| 16 | 8/18 | Oakley | Sellars Ave | tarsalis |
| 17 | 8/18 | Antioch | Cavallo Rd/Wilbur Ave | tarsalis |
| 18 | 8/21 | Brentwood | Sycamore Av/Garin Pkwy | tarsalis |
| 19 | 8/21 | Antioch | Hillridge Wy/Woodhaven | tarsalis |
| 20 | 8/21 | Antioch | W 10th/E St | tarsalis |
| 21 | 8/21 | Antioch | Ranch Hollow/Ranch Point | tarsalis |
| 22 | 8/18 | Knightsen | Palm Tract | pipiens |
| 23 | 8/25 | Oakley | Fetzer Ln/Oakley Rd | tarsalis |
| 24 | 9/18 | Pittsburg | Golf Club Rd/W Leland Rd | tarsalis |
| 25 | 9/25 | Oakley | Hillridge Wy/Woodhaven | tarsalis |
| 26 | 9/25 | Brentwood | Redhaven St/Garrin Pkwy | pipiens |
| 27 | 9/29 | Brentwood | Sycamore/Garrin | tarsalis |
| 28 | 10/27 | Pittsburg | W. Leland/Daffodil | tarsalis |
| 29 | 10/8 | Pittsburg | W 10th Ave/Bubbles | tarsalis |
| 30 | 10/8 | Pittsburg | W 10th Ave/Bubbles | tarsalis |
Dead Birds: 88
| n | Date Reported | City | Cross Streets | Species |
|---|---|---|---|---|
| 1 | 5/16 | Alamo | Stone Valley/St Paul | Hermit Thrush |
| 2 | 6/30 | Antioch | Candlestick Dr/Silverado Dr | Western Scrub Jay |
| 3 | 6/26 | Knightsen | Tule Lane/Knightsen Ave | Western Scrub Jay |
| 4 | 7/11 | Antioch | Twining/Burwood | American Crow |
| 5 | 7/11 | Antioch | Santa Barbara/Rio Grande | American Crow |
| 6 | 7/11 | Antioch | Tregallas/Windsor | American Crow |
| 7 | 7/3 | Walnut Creek | Parish/Terrebonne | House Finch |
| 8 | 7/18 | Antioch | Hansen/Witherow | Western Scrub Jay |
| 9 | 7/20 | Antioch | Parsons/18th | Western Scrub Jay |
| 10 | 7/22 | Antioch | Camby/G St | Western Scrub Jay |
| 11 | 7/8 | Antioch | Tabora/Fontana | House Finch |
| 12 | 7/9 | Antioch | Contra Loma/Putnam | American Crow |
| 13 | 7/28 | Antioch | Paris/Venice | Western Scrub Jay |
| 14 | 7/14 | Antioch | Lafayette/Silverado | Western Scrub Jay |
| 15 | 7/15 | Antioch | Huntington/Mountaire | American Crow |
| 16 | 7/16 | Antioch | South Royal Links/Dunes | American Crow |
| 17 | 7/29 | Pittsburg | Railroad/Yosemite | American Crow |
| 18 | 7/15 | Antioch | Blythe/Meadowbrook | House Sparrow |
| 19 | 7/18 | Antioch | Lone Tree/Clearbrook | House Finch |
| 20 | 7/20 | Antioch | Rocky Point/Bluerock | House Finch |
| 21 | 7/21 | Antioch | Green Hills Cir/Ridgeview | N Mockingbird |
| 22 | 7/22 | Antioch | Biglow/18th | Western Scrub Jay |
| 23 | 7/22 | Antioch | Worrell/Roosevelt | Western Scrub Jay |
| 24 | 7/22 | San Ramon | Ascot/Burns | Barn Owl |
| 25 | 7/7 | Discovery Bay | New Melones/S Lakefront | American Robin |
| 26 | 7/10 | Concord | Hillsborough/Yukon | House Sparrow |
| 27 | 7/30 | Antioch | Lone Tree/Boulder | American Crow |
| 28 | 7/28 | Antioch | Rio Grande/St Christopher | House Finch |
| 29 | 7/29 | Brentwood | Sycamore/Whitehall | Western Scrub Jay |
| 30 | 8/6 | Antioch | 18th E/Viera | American Crow |
| 31 | 8/7 | Antioch | Golden Bear/Kodiak | American Crow |
| 32 | 8/11 | Antioch | Ferngrove/Terrace View | Western Scrub Jay |
| 33 | 7/23 | Walnut Creek | Freeman/Hilton | House Finch |
| 34 | 7/28 | Lafayette | Willow/Dyer | American Robin |
| 35 | 8/4 | Antioch | Mt Hamilton/Mokelume | Western Scrub Jay |
| 36 | 8/13 | Antioch | Woodhaven/Mesa Ridge | American Crow |
| 37 | 8/18 | Antioch | Ashburton/Lindley | American Crow |
| 38 | 8/5 | Antioch | Ranch Hollow/Stonecrest | Western Scrub Jay |
| 39 | 8/6 | Brentwood | Balfour/Sellars | N Mockingbird |
| 40 | 8/7 | Pittsburg | Stoneman/Loveridge | House Finch |
| 41 | 8/19 | Oakley | Delta/Sellars | American Crow |
| 42 | 8/20 | Antioch | Northbrook Ct/Limewood Dr | American Crow |
| 43 | 8/21 | Brentwood | Norris St/Redhaven St | American Crow |
| 44 | 8/22 | Pittsburg | Rangewood Ct/Rangewood Dr | American Crow |
| 45 | 8/22 | Brentwood | Fairview/Central | American Crow |
| 46 | 8/25 | Knightsen | Knightsen/Delta | American Crow |
| 47 | 8/12 | Antioch | Mt. Hamilton/Dallas Ranch | Western Scrub Jay |
| 48 | 8/14 | Antioch | Hyacinth Ct/Larkspur | Western Scrub Jay |
| 49 | 8/18 | Antioch | G St/5th St | Western Scrub Jay |
| 50 | 8/26 | Oakley | Canterbury Ln/Oakley Rd | Western Scrub Jay |
| 51 | 8/29 | Brentwood | Garin Pkwy/Oak St | American Crow |
| 52 | 8/13 | Oakley | Vinehill/Neroly | American Robin |
| 53 | 8/19 | Brentwood | Sequoia/McClaren | Western Scrub Jay |
| 54 | 8/20 | Brentwood | Darby/Sweetgrass | House Finch |
| 55 | 8/20 | Brentwood | Arlington/Claremont | American Robin |
| 56 | 9/3 | Orinda | Keith Drive/Donald Drive | Western Scrub Jay |
| 57 | 9/4 | Pittsburg | Surf Drive/Palm Drive | Western Scrub Jay |
| 58 | 8/28 | Discovery Bay | Cabrillo/Discovery Bay Pl | Western Scrub Jay |
| 59 | 9/1 | San Ramon | Rock Rose/Red Willow | Great Horned Owl |
| 60 | 9/11 | Oakley | Tule Ln/Cow Poke Ln | American Crow |
| 61 | 9/14 | Antioch | Barkwood Ct/Black Oak Wy | American Crow |
| 62 | 9/15 | Brentwood | Dainty Ave/Jakes Ln | American Crow |
| 63 | 9/16 | Antioch | Vera Ave/Willow Ave | Western Scrub Jay |
| 64 | 9/4 | Pittsburg | Oakridge Ln/Heatherwood Dr | Western Scrub Jay |
| 65 | 9/3 | Walnut Creek | Norris Rd/Mt. View Blvd | California Towhee |
| 66 | 9/4 | Brentwood | Brentwood Blvd/Sandcreek Rd | Common Yellowthroat |
| 67 | 9/17 | Brentwood | Orchard Dr/McLaren | American Crow |
| 68 | 9/17 | Brentwood | Gristmill Dr/Wheatfield Wy | American Crow |
| 69 | 9/9 | Alamo | Aspero/Marks | Western Tanager |
| 70 | 9/10 | Antioch | Inez Wy/Crocker | Western Scrub Jay |
| 71 | 9/10 | Orinda | Valencia Rd/Don Gabriel | American Robin |
| 72 | 9/22 | Brentwood | Brentwood Blvd/Spruce | American Crow |
| 73 | 9/11 | Concord | Meadowbrook Wy/Holbrook | Green Heron |
| 74 | 9/25 | Brentwood | Eagle Ln/Byron Hwy | Western Scrub Jay |
| 75 | 9/10 | Danville | Waterman Cir/Harlan | California Towhee |
| 76 | 9/10 | Antioch | Lefebvre Wy/Hillcrest | American Robin |
| 77 | 9/10 | Concord | Barbis Wy/Kimball | American Robin |
| 78 | 9/12 | Antioch | Whitetail Ct/Country Hills Dr | Fox Sparrow |
| 79 | 10/6 | Brentwood | Aurora Ct/Shadowcliff Wy | American Crow |
| 80 | 10/6 | Brentwood | Carribou Terr/Fawnbrook Dr | American Crow |
| 81 | 9/17 | Antioch | Lone Tree Wy/Deer Valley | Yellow Warbler |
| 82 | 9/18 | Walnut Creek | Country Ln/Walnut | Lesser Goldfinch |
| 83 | 9/26 | Antioch | Peachtree/Silverado | Western Scrub Jay |
| 84 | 9/29 | Brentwood | Claremont Dr/Balfour | Western Scrub Jay |
| 85 | 9/29 | Martinez | Granite Ct/Center | Lesser Goldfinch |
| 86 | 10/7 | Brentwood | Empire Ave/Lone Tree Wy | American Crow |
| 87 | 9/30 | Concord | Concord Blvd/Hames | Western Scrub Jay |
| 88 | 11/6 | Walnut Creek | Hackney Ln/Trails End Dr | Western Scrub Jay |
Sentinel Chicken Flocks: 2
| #/10 | Date Bleed | Area |
|---|---|---|
| 1 | 8/18 | Holland Tract |
| 1 | 8/18 | Oakley |
| 2 | 9/2 | Holland Tract |
| 10 | 9/15 | Holland Tract |
| 4 | 9/15 | Oakley |
| 1 | 10/13 | Oakley |
Note: Chickens do not die from West Nile virus. They develop antibodies to the virus which is detected in their blood.
Horses: 3
| n | Date Reported | City | Dead/Euthanized |
|---|---|---|---|
| 1 | 8/9 | Brentwood | No |
| 2 | 2/29 | Brentwood | Yes |
| 3 | 10/4 | Martinez | Yes |