Bay City News
San Mateo County mosquito control officials sprayed for mosquitoes in a roughly square-mile section of East San Mateo Wednesday night to prevent the spread of West Nile virus.
Five dead birds that tested positive for West Nile virus were found in San Mateo in June and July, raising concern about the spread of the disease, according to the San Mateo County Mosquito and Vector Control District.
Two of the dead birds, both crows, were found in San Mateo on July 21 and 23. The other three were found in San Carlos, Portola Valley and Menlo Park.
The district also found mosquitoes carrying the virus in San Mateo on Friday.