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: 17

n	Date Collected	City	Cross Streets	Species
1	7/11/18	Discovery Bay	Cherry Hills Drive x Hwy 4	Culex pipiens
2	7/16/18	Agricultural Area East of Brentwood	Orwood Road x Levee Road	Culex tarsalis
3	7/30/18	Discovery Bay	Marina Rd x Willow Lake Rd	Culex pipiens
4	8/1//18	Oakley	E. Summer Lake Dr x Cypress Rd	Culex tarsalis
5	8/8/18	Discovery Bay	Willow Lake Rd x Discovery Bay Blvd	Culex pipiens
6	8/13/18	Holland Tract Area	Holland Tract	Culex tarsalis
7	8/13/18	Martinez	Waterfront Rd Mococo Rd	Culex tarsalis
8	8/9/18	Oakley	Blue Lake Ct x Clear Lake Dr	Culex pipiens
9	8/15/18	Discovery Bay	Bixler Rd x Point of Timber Rd	Culex tarsalis
10	8/15/18	Quimby Island	Quimby Island	Culex tarsalis
11	8/20/18	Discovery Bay	Cherry Hills Dr. x Hwy 4	Culex pipiens
12	8/20/18	Byron	Rankin Rd x Western Farms Ranch Rd	Culex tarsalis
13	8/22/18	Brentwood	Fertado Ln x Ellisa Ln.	Culex pipiens
14	8/29/18	Quimby Island	Quimby Island	Culex tarsalis
15	8/29/18	Brentwood	Eden Plains Rd x Arabian Ln	Culex pipiens
16	9/11/18	Quimby Island	Quimby Island	Culex tarsalis
17	9/17/18	Bethel Island	Stone Rd	Culex tarsalis

Dead Birds: 13

n	Date Reported	City	Cross Streets	Species
1	7/29/18	Brentwood	Sycamore Ave x Garin Pky	California Scrub-Jay
2	8/5/18	Discovery Bay	Discovery Bay Blvd x Willow Lake Rd	California Scrub-Jay
3	8/5/18	Discovery Bay	Dune Point Wy x Dune Point Pl	California Scrub-Jay
4	8/8/18	Brentwood	Walnut Blvd x Carnegie Ln	American Crow
5	8/15/18	Brentwood	Fertado Ln x Ellisa Ln	American Crow
6	8/15/18	Discovery Bay	Wayfarer Dr x Cherry Hills Dr	American Crow
7	8/15/18	Antioch	Valley Wy x Ridgeview Dr	American Crow
8	8/15/18	Concord	Concord Blvd x Crestwood Cir	California Scrub Jay
9	8/28/18	Martinez	Blum Rd x Alan Wy	California Scrub Jay
10	8/29/18	Discovery Bay	Westport Cir x N Lakefront Loop	American Crow
11	8/30/18	Discovery Bay	Greenfield Wy x Greenfield Ct	American Crow
12	9/12/18	Oakley	Main St x Norcross Ln	American Crow
13	9/27/18	Brentwood	Fertado Ln x Marsh Creek Rd	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
7	7/2/18	Holland Tract
3	7/16/18	Martinez
3	8/13/18	Holland Tract
1	9/10/18	Martinez
1	9/10/18	Oakley
1	9/24/18	Oakley

Horses: 0

n

Date Reported

City

Dead/Euthanized