Los Angeles County health officials have confirmed the first positive sample of West Nile virus drawn from a mosquito trap. The sample was collected from a trap in the Winnetka area of the San ...

The first mosquito-related death in the Bay Area and the detection of mosquitoes carrying West Nile ... virus were recovered from a trap in the Winnetka neighborhood of the San Fernando Valley.

A Culex tarsalis mosquito, one of the species which transmits West Nile virus. Courtesy CDC/ San Gabriel Valley Mosquito ... near where the birds have been found, both to check if mosquito ...

Horses can be inoclated against the disease. No birds with West Nile virus have yet been found in San Mateo County.