The District regularly traps and tests mosquitoes throughout the Coachella Valley.

There are two types of mosquitoes in our valley that can be found with - and transmit - viruses such as West Nile Virus (WNV), Saint Louis Encephalitis Virus (SLEV), and Western equine encephalitis (WEE). When virus is found in mammal-biting mosquitoes, the risk for human disease increases because these mosquitoes are much more likely to bite people. Wet, warm weather make optimal conditions for abundant mosquito breeding and a high risk of occurrence of human cases.