Skip to main content

2016 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: 11
nDate CollectedCityCross StreetsSpecies
17/11/16KnightsenHolland Tract AreaCx tarsalis
27/18/16AntiochCavallo Ave x Wilbur AveCx tarsalis
38/1/16KnightsenHolland Tract AreaCx tarsalis
48/1/16ByronByron Hwy x Rankin RdCx tarsalis
58/29/16Bethel IslandStone RdCx tarsalis
68/29/16Discovery BayByron Tract NWCx tarsalis
79/6/16ByronByron Hwy x Rankin RdCx tarsalis
89/6/16BrentwoodSycamore Ave x Garin PkwyCx tarsalis
99/19/16KnightsenHolland Tract AreaCx tarsalis
1010/3/16ByronByron Hwy x Rankin RdCx tarsalis
1110/24/16Bethel IslandStone RdCx tarsalis
Dead Birds: 33
nDate ReportedCityCross StreetsSpecies
16/13/16AntiochPrewett Ranch Dr x Mokelumne DrAmerican Crow
27/11/16BrentwoodEden Plains Rd x Chestnut StWestern Scrub Jay
37/12/16AntiochMarigold Wy x Prewett Ranch DrAmerican Crow
47/13/16BrentwoodOak St x 2nd StAmerican Crow
57/25/16OakleyOakley Rd x Trenton StAmerican Crow
67/31/16BlackhawkDeer Meadow Dr x Live Oak DrAmerican Crow
78/1/16OakleyBig Bear Rd x Bernard RdWestern Scrub Jay
88/4/16AlamoStone Valley Rd x Alamo Glen DrAmerican Crow
98/7/16AlamoCamino Sobrante x Orinda WyAmerican Crow
108/8/16BrentwoodBalfour Rd x Fairview AveAmerican Crow
118/9/16ConcordGlazier Dr x Armand DrAmerican Crow
128/9/16AntiochLone Tree Wy x Deer Valley RdWestern Scrub Jay
138/18/16Pleasant HillGeary Rd x Pleasant Hill RdAmerican Crow
148/19/16OakleyLakespring Dr x Beaulieu LnWestern Scrub Jay
158/23/16DanvilleVerona Ave x Love LnAmerican Crow
168/24/16ConcordTreat Blvd x Oak Grove RdAmerican Crow
178/25/16ConcordMichigan Blvd x Washington BlvdAmerican Crow
188/30/16ConcordTreat Blvd x Oak Grove RdAmerican Crow
198/31/16Pleasant HillHubbard Ave x Roberta AveWestern Scrub Jay
209/7/16AntiochTaylor Wy x Silveria WyAmerican Crow
219/7/16ConcordGlazier Dr x Mercer CtAmerican Crow
229/8/16ConcordDenkinger Rd x Wilson LnAmerican Crow
239/14/16ConcordBailey Rd x Clayton RdCalifornia Scrub Jay
249/16/16Walnut CreekPrimrose Ln x Peachwillow LnAmerican Crow
259/20/16MartinezMorello Ave x Morello Hills DrAmerican Crow
269/22/16ConcordClayton Rd x Bailey RdAmerican Crow
279/28/16ConcordMendocino Dr x Salem StAmerican Crow
2810/3/16DanvilleOld Farm Rd x Contada CirAmerican Crow
2910/4/16DanvilleGreen Valley Rd x Blemer RdAmerican Crow
3010/7/16Walnut CreekOak Grove Rd x Peachwillow LnAmerican Crow
3110/10/16Walnut CreekLos Felicias Ave x San Antonio DrAmerican Crow
3210/11/16Walnut CreekNaranja Dr x Walnut AveAmerican Crow
3310/11/16ConcordSunshine Dr x Meadow LnAmerican Crow


Sentinel Chicken Flocks: 2
#/10Date BleedArea
1/108/1/16Holland Tract
2/108/15/16Holland 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