The West Nile virus has resurfaced in Contra Costa County, according to the county’s Mosquito and Vector Control District as officials in Marin and Sonoma counties also warned residents to anticipate a bad mosquito season.  

A dead American crow recently found near the intersection of Danville Boulevard and Camille Place in Alamo tested positive for the disease.

Authorities say the first line of defense against mosquitoes carrying the virus is to dump any standing water.

Residents are also advised to avoid being outdoors when mosquitoes are present, usually at dawn or dusk and to wear mosquito repellents while outdoors.

The public is urged to report dead birds, which can then be tested for the virus, to the state hotline at (877) 968-2473 or at WestNile.CA.Gov.