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2015 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: 8
nDate CollectedCityCross StreetsSpecies
16/15/15OakleyE. Summer Lakes Dr. x E. Cypress Rd.Culex tarsalis
26/15/15OakleyOakley Rd. x Main St.Culex tarsalis
38/17/15MartinezMococo Rd. x Marina Vista Ave.Culex tarsalis
49/14/15Discovery BayCherry Hills Dr.Culex tarsalis
59/21/15Discovery BayByron Tract NWCulex tarsalis
69/21/15Antioch8th St. x A St.Culex tarsalis
710/2/15PittsburgGolf Club Rd. x Leland Rd.Culex tarsalis
810/12/15MartinezMococo Rd. x Marina Vista Ave.Culex tarsalis
Dead Birds: 11
nDate ReportedCityCross StreetsSpecies
17/14/15OakleyNeroly Rd. x Oakley Rd.American Crow
27/23/15DanvilleRoan Dr. x Clydesdale Dr.American Crow
38/9/15Pleasant HillChilpancingo Pky x Camelback Rd.Steller's Jay
48/21/15ConcordPeach Pl. x Oak Grove Rd.American Crow
58/31/15Walnut CreekLilac Dr. x Newell Ave.American Crow
69/1/15PittsburgBuchanan Rd. x Loveridge Rd.American Crow
79/3/15BrentwoodLone Tree Way x Jeffery WayAmerican Crow
89/9/15San RamonDos Rios Dr. x Bollinger Cyn Rd.American Crow
99/27/15DanvillePodva Rd. x San Ramon Valley Blvd.Western Scrub Jay
1010/5/15DanvilleSilver Lake Dr. x El Capitan Dr.American Crow
1110/13/15DanvilleEverett Dr. x Paraiso Dr.American Crow


Sentinel Chicken Flocks: 3
#/10Date BleedArea
 2/107/13/15Holland Tract
4/107/27/15Holland Tract
1/108/24/15Holland Tract
1/109/8/15Holland 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