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	French Dr x Fletcher Ln	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	1014/20	Brentwood	Giotto Dr x Sofia Wy	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	9/8	Holland Tract
2/6	9/21	Oakley
1/6	10/19	Oakley
2/6	10/19	Martinez

Horses: 0

n

Date Reported

City

Dead/Euthanized