2021 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: 2

n Date Reported City Cross Streets Species
1 6/29/21 Byron Western Farms Ranch Rd Culex tarsalis
2 7/13/21 Brentwood Orwood Rd x Levee Rd Culex tarsalis



Dead Birds: 0

n Date Reported City Cross Streets Species

Sentinel Chicken Flocks: 0

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

Horses: 0

n Date Reported City Dead/Euthanized


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