From KRON4
September 10, 2021
BRENTWOOD, Calif. (KRON) – Two more groups of mosquitoes tested positive for West Nile Virus, according to the Contra Costa Mosquito and Vector Control District.
Both groups were collected in eastern Contra Costa County: Holland Tract and an agriculture area near Brentwood.
There are now seven groups of mosquitoes and a dead bird that have tested positive for the virus in Contra Costa County this year.