From the Martinez, CA Patch
August 12, 2022
CONTRA COSTA COUNTY, CA — More mosquitoes have tested positive for West Nile virus in Contra Costa County, authorities said Friday.
The mosquitoes were collected from a trap in an agricultural area east of Brentwood, according to a news release from the Contra Costa Mosquito & Vector Control District.
A previous group of mosquitoes that tested positive this year for WNV was found in Oakley.
WNV comes from certain birds, mostly crows and jays; mosquitoes become infected after biting an infected bird.