The Contra Costa Mosquito & Vector Control District (District) has been protecting public health since 1927. By reporting dead birds, Contra Costa County residents can take an active role in protecting public health as well. And now reporting dead birds is easier, as the California West Nile virus (WNV) and Dead Bird Call Center is open and taking calls for 2021.
 
WNV is a virus carried by certain birds. Mosquitoes can bite an infected bird and spread the virus by biting another bird or a human. Some infected birds, particularly crows and jays, can die of WNV and are often the first sign of WNV in a particular area.