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.

For information regarding human cases, please click here.


Mosquito Samples: 1

n Date Collected City Cross Streets Species
1 10/28/19 Martinez I-680 x Waterfront Rd Culex tarsalis

Dead Birds:1

n Date Reported City Cross Streets Species
1 9/3/19 Danville Tweed Drive x Old Orchard Drive

American Crow



Sentinel Chicken Flocks: 1

Note: Chickens do not die from West Nile virus. They develop antibodies to the virus which is detected in their blood.

#/10 Date Bleed Area
1 8/26 Holland Tract
1 9/23 Holland Tract

Horses: 0

n Date Reported City Dead/Euthanized
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