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West Nile Virus Activity 2019

May contain: animal, bird, and crow

West Nile virus is endemic to Los Angeles County. This means it is found naturally in our city environments. During warmer weather, the virus activity increases, which increases the chance for our traps to catch mosquitoes carrying West Nile virus and any other viruses that can be a public health threat. 

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


2019 West Nile Virus Activity


West Nile Virus Positive Mosquito Samples

A sample is a random collection of 10-50 mosquitoes from a trap

City/CommunityNumber of WNV+ Mosquito Samples
Baldwin Park3
Glendora 1
La Verne1
Los Angeles County (91746)2
Monterey Park1
San Dimas 1
Temple City1
West Covina2


West Nile Virus Positive Dead Birds

City/CommunityNumber of WNV+ dead birds
La Verne1