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2019 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: 1
nDate CollectedCityCross StreetsSpecies
110/28/19MartinezI-680 x Waterfront RdCulex tarsalis
Dead Birds: 1
nDate ReportedCityCross StreetsSpecies
19/3/19DanvilleTweed Drive x Old Orchard DriveAmerican Crow


Sentinel Chicken Flocks: 1
#/10Date BleedArea
18/26/19Holland Tract
19/23/19Holland 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