West Nile Virus Activity Archive

May contain: animal, bird, and crow

Did you know West Nile virus is the most common mosquito-borne disease that affect residents in Los Angeles County?

The District surveillance staff routinely collects samples of mosquitoes from traps and have them tested for a mosquito-borne diseases. In addition, dead birds, which can carry West Nile virus, are submitted for testing.

Human cases are reported by the L.A. County Department of Public Health and Pasadena Health Department.

2018 West Nile Virus Activity

West Nile Virus Positive Mosquito Samples

West Nile Virus Positive Dead Birds