SMC Detects West Nile Virus In Redwood City Crow

REDWOOD CITY, CA — A dead crow retrieved from Redwood Shores earlier this week tested positive for West Nile virus, according to the San Mateo County Mosquito and Vector Control District.

Officials said the infection confirmed Monday was the first of the year in San Mateo County, noting reports of dead birds are usually the first sign of the virus's presence.

"Certain birds, including American crows, common ravens, and American robins may carry WNV," the district wrote this week. "When a mosquito bites an infected bird, the mosquito can become infected. Infected mosquitoes can then pass the virus on to people or other animals that they bite."

When a bird tests positive for WNV, county staffers set mosquito traps in the nearest neighborhoods to determine if the populations are carrying the virus. The control district regularly inspects and treats known breeding sources to cut down on the number of mosquitoes that could get infected and further transmit West Nile.

The count encourages residents to protect themselves by using mosquito repellents with ingredients like DEET or picaridin, especially during the dusk and dawn hours when mosquitoes are most active. Neighbors should also take time to remove standing water from their properties.

Residents can report mosquito activity by calling 650-344-8592 and report dead birds at 877-968-2473.