The Southern Nevada Health District’s Vector Surveillance Program monitors mosquitoes that are known to spread diseases to people. The Health District will update this site with information on positive mosquito submission pools and mosquitoes that are tested in Clark County.
St. Louis Encephalitis
The Vector Surveillance Program has identified St. Louis Encephalitis (SLE)-positive mosquitoes in Clark County. There have been no reports of human cases of SLE in Clark County since 2007.
West Nile virus is closely related to the St. Louis Encephalitis virus. The virus can infect humans, birds, mosquitoes, horses, and some other mammals. With the exception of 2010, West Nile virus has been detected in mosquitoes in Clark County every year since 2004.
WNV+ Submission Pools
Mosquitoes in WNV+ Pools
3 (*unique ZIP codes)
St. Louis Encephalitis and West Nile Virus
This season the Southern Nevada Health District has detected both St. Louis Encephalitis and West Nile virus-positive mosquitoes in the same submission pools.