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2009 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: 17
nDate CollectedCityCross StreetsSpecies
13/27MartinezImhoff Placepipiens
24/3MartinezIndustrial Area North of Hwy 4erythrothorax
34/3MartinezIndustrial Area North of Hwy 4erythrothorax
44/10PittsburgRailroad Ave. x E. Leland Rd.inornata
54/10Bay PointSan Marco Blvd. x Hwy 4tarsalis
64/10PinoleTennent Ave. x San Pablo Ave.erythrothorax
74/16PittsburgRailroad Ave. x E. Leland Rd.inornata
84/23MartinezIndustrial Area North of Hwy 4erythrothorax
94/23MartinezIndustrial Area North of Hwy 4erythrothorax
104/23MartinezIndustrial Area North of Hwy 4erythrothorax
114/23CrockettB Street x San Pablo Ave.tarsalis
127/7OakleyBethel Island Rd x E. Cypresspipiens
137/13OakleyBethel Island Rd x E. Cypresspipiens
147/27KnightsenHolland Tracttarsalis
158/4AntiochWilbur Ave. x Cavallo Rd.tarsalis
168/4AntiochWilbur Ave. x Cavallo Rd.pipiens
178/20Discovery BayHwy 4 x Cherry Hill Dr.tarsalis
Dead Birds: 45
nDate ReportedCityCross StreetsSpecies
16/28AlamoLivorna Rd. x Serafix Rd.Western Scrub Jay
27/2DanvilleBordeaux Ct. x Tuscany WyHouse Finch
37/7ConcordSt. George Dr. x Port Chicago HwyHouse Finch
46/30MartinezEl Dorado Ln x Howe St.House Finch
57/21BrentwoodSundale Ln. x Apple Hill Dr.American Crow
67/09Bay PointMtn. View Ave. x Hanlon Wy.European Starling
77/10AntiochJudsonville Dr. x Golf Course Rd.House Finch
87/13OrindaEl Toyonal Rd. x Vallecito Pl.Flycatcher
97/13DanvillePark Hill Rd. x Old OrchardAmerican Robin
107/13OrindaIrwin Wy. x Orinda Wy.Lesser Goldfinch
117/13RichmondBeck St. x Cutting Blvd.Western Scrub Jay
127/14AntiochMatterhorn Ct. x Cache PeakCooper's Hawk
137/21DanvilleDiablo Rd. x Fairway Dr.Cooper's Hawk
148/4BrentwoodTwilight Ct. x Trailside Dr.American Crow
157/21AlamoChilders Ln x Childers Ct.Western Scrub Jay
167/30Discovery BayReef Ct. x Clipper Dr.House Finch
178/18BrentwoodCesa Ave. x 1st St.American Crow
188/18BrentwoodByron Hwy x Orwood Rd.American Crow
198/17PittsburgDiehl Wy. x Suzanne Dr.Western Scrub Jay
208/20OakleyWalnut Dr. x Orchard Park Dr.American Crow
218/24OakleyMain St. x Cypress St.American Crow
228/12AntiochA St. x 18th St.Western Scrub Jay
238/14ByronByron Hwy x Rankin Rd.Western Sandpiper
248/27BrentwoodRockwell St.x Walnut St.American Crow
258/28Discovery BayFoghorn Wy. x Yacht Dr.American Crow
269/1OakleyKnarlwood Rd. x Oakley Rd.American Crow
279/1Walnut CreekCivic Dr. x N. BroadwayAmerican Crow
289/3BrentwoodWindsor Wy. x Village Dr.American Crow
299/8BrentwoodPheasant Run Terr. x Wildcat Ln.Western Scrub Jay
309/10BrentwoodTricia St. x Village Dr.American Crow
319/3Walnut CreekBridgefield Rd. x Olympic Blvd.Western Scrub Jay
329/15ByronCamino Diablo Rd. x Byron HwyAmerican Crow
339/8BrentwoodBreakwater Wy. x Minnesota Ave.Western Scrub Jay
349/17BrentwoodLongleaf Ct. x Clearview Dr.American Crow
359/18BrentwoodSecond St. x Pine St.Western Scrub Jay
369/22DanvilleAdobe Dr. x Rockport Ct.American Crow
379/22BrentwoodBalfour Rd. x Sellers Ave.American Crow
389/22San RamonAlcosta Blvd. x Bollinger Cyn Rd.American Crow
399/23Walnut CreekCastle Rock Rd. x Bowling Green Dr.American Crow
409/24BrentwoodMeadowgates Wy. x San Jose Ave.American Crow
419/24BrentwoodWildrose Wy. x Laurain WyAmerican Crow
4210/1OakleyCircle Dr. x Alder Dr.Western Scrub Jay
4310/7OakleyRobinwood Ave. x Quail Valley RunAmerican Crow
4410/9BrentwoodSellers Ave. x Sunset Rd.American Crow
4510/16BrentwoodMills Dr. x Armstrong Dr.Western Scrub Jay


Sentinel Chicken Flocks: 2
#/10Date BleedArea
17/20Holland Tract
38/31Holland Tract
18/31Holland 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