From the Mercury News
August 14, 2020
A group of mosquitoes in Contra Costa County tested positive for West Nile virus, the first signal of the virus in the county this year, officials said Friday.
The mosquitoes were caught in a trap near Byron, about 30 miles away from where a dead bird tested positive for West Nile last week, just across the Alameda County border, in Dublin.
August and September are peak season for mosquito-to-human transmission of the West Nile virus, said Steve Schutz, the Contra Costa Mosquito and Vector Control District’s scientific programs manager.