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2018 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
17/11/18Discovery BayCherry Hills Drive x Hwy 4Culex pipiens
27/16/18Agricultural Area East of BrentwoodOrwood Road x Levee RoadCulex tarsalis
37/30/18Discovery BayMarina Rd x Willow Lake RdCulex pipiens
48/1//18OakleyE. Summer Lake Dr x Cypress RdCulex tarsalis
58/8/18Discovery BayWillow Lake Rd x Discovery Bay BlvdCulex pipiens
68/13/18Holland Tract AreaHolland TractCulex tarsalis
78/13/18MartinezWaterfront Rd Mococo RdCulex tarsalis
88/9/18OakleyBlue Lake Ct x Clear Lake DrCulex pipiens
98/15/18Discovery BayBixler Rd x Point of Timber RdCulex tarsalis
108/15/18Quimby IslandQuimby IslandCulex tarsalis
118/20/18Discovery BayCherry Hills Dr. x Hwy 4Culex pipiens
128/20/18ByronRankin Rd x Western Farms Ranch RdCulex tarsalis
138/22/18BrentwoodFertado Ln x Ellisa Ln.Culex pipiens
148/29/18Quimby IslandQuimby IslandCulex tarsalis
158/29/18BrentwoodEden Plains Rd x Arabian LnCulex pipiens
169/11/18Quimby IslandQuimby IslandCulex tarsalis
179/17/18Bethel IslandStone RdCulex tarsalis
Dead Birds: 13
nDate ReportedCityCross StreetsSpecies
17/29/18BrentwoodSycamore Ave x Garin PkyCalifornia Scrub-Jay
28/5/18Discovery BayDiscovery Bay Blvd x Willow Lake RdCalifornia Scrub-Jay
38/5/18Discovery BayDune Point Wy x Dune Point PlCalifornia Scrub-Jay
48/8/18BrentwoodWalnut Blvd x Carnegie LnAmerican Crow
58/15/18BrentwoodFertado Ln x Ellisa LnAmerican Crow
68/15/18Discovery BayWayfarer Dr x Cherry Hills DrAmerican Crow
78/15/18AntiochValley Wy x Ridgeview DrAmerican Crow
88/15/18ConcordConcord Blvd x Crestwood CirCalifornia Scrub Jay
98/28/18MartinezBlum Rd x Alan WyCalifornia Scrub Jay
108/29/18Discovery BayWestport Cir x N Lakefront LoopAmerican Crow
118/30/18Discovery BayGreenfield Wy x Greenfield CtAmerican Crow
129/12/18OakleyMain St x Norcross LnAmerican Crow
139/27/18BrentwoodFertado Ln x Marsh Creek RdAmerican Crow


Sentinel Chicken Flocks: 3
#/10Date BleedArea
77/2/18Holland Tract
38/13/18Holland 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