2020 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: 13
| n | Date Collected | City | Cross Streets | Species |
|---|---|---|---|---|
| 1 | 8/10/20 | Byron | Byron Hwy x Rankin Rd | Culex tarsalis |
| 2 | 8/17/20 | Knightsen | Palm Tract | Culex pipiens |
| 3 | 8/24/20 | Discovery Bay | Cherry Hills Dr x Hwy 4 | Culex pipiens |
| 4 | 8/25/20 | Brentwood | French Dr x Fletcher Ln | Culex tarsalis |
| 5 | 8/25/20 | Brentwood | Brentwood | Culex pipiens |
| 6 | 8/25/20 | Brentwood | Outrigger Cir x Breakwater Wy | Culex pipiens |
| 7 | 8/25/20 | Brentwood | Bougainvilla Dr Walnut Blvd | Culex tarsalis |
| 8 | 8/31/20 | Brentwood | Elkins Wy x Iparq Wy | Culex pipiens |
| 9 | 9/8/20 | Discovery Bay | Cherry Hills Dr x Wayfarer Dr | Culex tarsalis |
| 10 | 9/8/20 | Brentwood | Rutherford Cir x Devonshire Lp | Culex tarsalis |
| 11 | 9/8/20 | Brentwood | Rutherford Cir x Devonshire Lp | Culex pipiens |
| 12 | 9/21/20 | Brentwood | Elkins Wy x Iparq Wy | Culex pipiens |
| 13 | 9/21/20 | Martinez | Interstate 680 x Waterfront Rd | Culex tarsalis |
Dead Birds: 22
| n | Date Reported | City | Cross Streets | Species |
|---|---|---|---|---|
| 1 | 8/15/20 | Martinez | Alhambra Ave x Alhambra Valley Rd | CA Scrub Jay |
| 2 | 8/22/20 | Brentwood | Rutherford Cir x Devonshire Lp | CA Scrub Jay |
| 3 | 8/22/20 | Brentwood | Peachwillow Dr x Central Blvd | American Crow |
| 4 | 8/23/20 | Brentwood | McClaren Rd x French Dr | American Crow |
| 5 | 8/24/20 | Antioch | Dallas Ranch Rd x Prewett Ranch Dr | American Crow |
| 6 | 8/25/20 | Brentwood | Armstrong Rd x Walnut Blvd | American Crow |
| 7 | 8/25/20 | Brentwood | Crescent Dr x Claremont Dr | CA Scrub Jay |
| 8 | 8/29/20 | Brentwood | Ironwood Dr x San Jose Dr | CA Scrub Jay |
| 9 | 8/30/20 | Discovery Bay | Sand Point Rd x Discovery Bay Blvd | American Crow |
| 10 | 8/31/20 | Brentwood | Sand Creek Rd x Highland Wy | CA Scrub Jay |
| 11 | 8/31/20 | Brentwood | Pescara Blvd x Castello Ranch Rd | American Crow |
| 12 | 8/31/20 | Brentwood | Autumn Valley Wy x Sutter Creek Wy | CA Scrub Jay |
| 13 | 9/2/20 | Brentwood | Woodside Dr x Minnesota Ave | American Crow |
| 14 | 9/3/20 | Concord | Ricardo Dr x Salvio St | American Crow |
| 15 | 9/8/20 | Brentwood | Brookwood Ct x Glenwillow Dr | CA Scrub Jay |
| 16 | 9/19/20 | Walnut Creek | Wimbledon Rd x Ygnacio Valley Rd | American Crow |
| 17 | 9/21/20 | Brentwood | Sofia Ct x Antica Dr | CA Scrub Jay |
| 18 | 10/3/20 | Brentwood | Balfour Rd x Bixler Rd | CA Scrub Jay |
| 19 | 9/28/20 | Brentwood | Armstron Rd x Carey Ln | American Crow |
| 20 | 10/6/20 | Concord | Minert Rd x Waltrip Ln | CA Scrub Jay |
| 21 | 10/8/20 | Brentwood | Cipriani Pl x La Pergola Dr | American Crow |
| 22 | 10/14/20 | Brentwood | Giotto Dr x Sofia Wy | American Crow |
Sentinel Chicken Flocks: 3
| #/10 | Date Bleed | Area |
|---|---|---|
| 2/10 | 9/8/20 | Holland Tract |
| 2/6 | 9/21/20 | Oakley |
| 1/6 | 10/19/20 | Martinez |
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 |
|---|---|---|---|