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.

2003 West Nile Virus Activity

West Nile Virus Positive Mosquito Samples

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

 No confirmations of positive mosquito samples

West Nile Virus Positive Dead Birds

 No confirmations of positive mosquito samples