Skip to main content

2014 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.

May contain: cutlery, spoon, chart, and plot

 For information regarding human cases, please click here.


Mosquito Samples: 25
nDate CollectedCityCross StreetsSpecies
16/23/14KnightsenHolland Tract AreaCulex tarsalis
27/7/14Discovery BayCherry Hills DriveCulex pipiens
37/7/14MartinezI-680 x Waterfront RoadCulex tarsalis
47/14/14Discovery BayCherry Hills Drive x Marina RoadCulex pipiens
57/16/14Discovery BayBixler Road x Balfour RoadCulex pipiens
67/17/14Discovery BayCherry Hills Drive x Wayfarer DriveCulex tarsalis
77/23/14Discovery BayByron Tract LeveeCulex tarsalis
88/6/14Discovery BayPoint of Timber Road x Bixler RoadCulex pipiens
98/12/14Discovery BayHighway 4 x Western Farms Ranch RoadCulex pipiens
108/13/14ConcordDavid Avenue x Cayce CourtCulex tarsalis
118/19/14Discovery BayByron Tract SECulex pipiens
128/19/14Discovery BayByron Tract NWCulex pipiens
138/19/14Discovery BayByron Tract NWCulex tarsalis
148/19/14Discovery BayByron Tract NWCulex tarsalis
158/20/14Discovery BayBixler Road x Point of Timber RoadCulex pipiens
168/18/14Discovery BayCherry Hills DriveCulex pipiens
178/25/14Discovery BayByron Tract NWCulex pipiens
188/26/14Discovery BayBixler Rd. x Point of Timber Rd.Culex pipiens
198/27/14Discovery BayWillow Lake Rd. x Beaver Ln.Culex pipiens
209/11/14BrentwoodOrwood TractCulex pipiens
219/16/14Discovery BayAgricultural AreaCulex pipiens
229/22/14Discovery BayByron Tract NWCulex tarsalis
2310/6/14Discovery BayByron Tract NWCulex pipiens
2410/13/14KnightsenHolland Tract AreaCulex tarsalis
2510/13/14PittsburgWillow Pass Rd. x Enterprise Cir.Culex tarsalis
Dead Birds: 44
nDate ReportedCityCross StreetsSpecies
14/23/14AlamoDanville Blvd. x Camille Ave.American Crow
25/18/14Pleasant HillMonument Blvd. x Mohr Ln.American Crow
36/9/14San RamonNorris Canyon Rd. x Bollinger Canyon Rd.American Crow
46/14/14OakleyEmpire Ave. x Main St.American Crow
56/17/14OakleyEmpire Ave. x Hemlock Dr.American Crow
66/17/14OakleyEmpire Ave. x Hemlock Dr.American Crow
76/20/14BrentwoodLone Tree Wy x O'Hara Ave.American Crow
86/25/14AntiochHillcrest Ave. x Sunset. Dr.American Crow
96/26/14San RamonBollinger Canyon Rd. x Norris Canyon Rd.American Crow
107/2/14Bethel IslandBethel Island Rd. x Gateway Rd.American Crow
117/9/14Walnut CreekArroyo Wy. x N. BroadwayAmerican Crow
127/10/14OakleyKay Ave. x O'Hara Ave.Western Scrub Jay
137/13/14AntiochCamby Rd. x G St.Western Scrub Jay
147/14/14BrentwoodFoothill Dr. x Balfour Rd.American Crow
157/16/14DanvilleHartford Rd. x Danville Blvd.American Crow
167/17/14AntiochHargrove St. x E. 18th St.American Crow
177/17/14BrentwoodMinnesota Ave. x Windmeadows Dr.Western Scrub Jay
187/21/14AntiochJudsonville Dr. x Hansen Dr.Western Scrub Jay
197/23/14ConcordBancroft Rd. x Hookston Rd.Western Scrub Jay
207/29/14PinoleMann Drive X Appian WayWestern Scrub Jay
218/6/14ConcordRyan Road x Wilmore AvenueAmerican Crow
228/6/14AlamoStone Valley Road x Roundhill RoadAmerican Crow
238/7/14DanvilleMontcrest Place x Love LaneWestern Scrub Jay
248/7/14Discovery BayCherry Hills Dr. x Wayfarer Dr.American Crow
258/10/14ConcordDavid Ave. x Getoun Dr.American Crow
268/11/14BrentwoodBurghley Ln. x Centennial Dr.American Crow
278/20/14ConcordTreat Blvd. x San Simeon Dr.American Crow
288/21/14Walnut CreekOak Rd. x Jones Rd.American Crow
298/21/14ConcordWhitman Rd. x W Gilardy Dr.American Crow
308/27/14Walnut CreekBancroft Rd. x Treat Blvd.American Crow
318/28/14DanvilleHarlan Dr. x St. Helena Dr.American Crow
329/2/14Walnut CreekWalnut Ave. x Warwick Dr.Western Scrub Jay
339/2/14OakleyEmpire Ave. x Truman Ln.American Crow
349/2/14BrentwoodForest View Common x Central Blvd.American Crow
359/4/14BrentwoodPayne Ave. x Walnut Blvd.Western Scrub Jay
369/8/14San RamonBroadmoor Dr. x Pine Valley Rd.American Crow
379/8/14OrindaAltamount Dr. x Moraga Wy.Stellar's Jay
389/12/14DanvilleVerona Ave. x Love Ln.American Crow
399/15/14San RamonAscot Dr. x Broadmoor Dr.American Crow
409/21/14DanvilleCamino Ramon x El Capitan Dr.American Crow
419/24/14Discovery BayClubhouse Dr. x Edgeview Dr.American Crow
429/29/14MartinezGlacier Dr. x Olympic Dr.Western Scrub Jay
4310/8/14AlamoRoyal Oaks Dr. x Peake Pl.American Crow
4410/12/14DanvilleCamino Ramon x Joaquin Dr.American Crow


Sentinel Chicken Flocks: 3
#/10Date BleedArea
1/106/16/14Holland Tract
3/106/30/14Holland Tract
1/107/14/14Holland Tract
1/107/28/14Holland Tract
1/108/11/14Holland Tract
3/108/11/14Walnut Creek
1/108/25/14Walnut Creek
1/109/22/14Holland Tract
1/1010/20/14Holland Tract

Note: Chickens do not die from West Nile virus. They develop antibodies to the virus which is detected in their blood.


Horses: 0
nDate ReportedCityDead/Euthanized