West Nile virus is a potentially serious illness that is most often spread through the bite of an infected mosquito.
The first human cases of West Nile virus along with the first positive mosquitoes in Clark County were reported in 2004. During every year since then (except 2010), the virus has been found in Clark County both in humans and in mosquitoes.
West Nile virus is now endemic in Clark County, which means that we expect to see the virus every year during the typical season, which usually runs from June through November. Visit the West Nile Surveillance webpage for more information.
Fortunately, the illness is preventable and the Southern Nevada Health District, in collaboration with the Nevada State Health Division, conducts annual mosquito surveillance.
You can play an important role in monitoring West Nile virus by reporting stagnant water, green swimming pools or other potential mosquito breeding sources to your local code enforcement agency.