LAS VEGAS (FOX5) — The Southern Nevada Health District has identified the first mosquitoes of the season to test positive for West Nile virus in Clark County.
The mosquitoes were collected in the 89121 ZIP code as part of the Health District’s ongoing mosquito surveillance program.
Health officials later added that since the first reports were announced, mosquitoes also tested positive in two additional ZIP codes: 89169 (central valley) and 89139 (Enterprise).
The Health District is reminding residents to take precautions and “Fight the Bite” to help reduce the impact of mosquitoes in the community.
MORE ON FOX5: First West Nile virus case of the season reported in Clark County resident
The Health District began routine mosquito surveillance in March, about one month earlier than usual, in response to warmer-than-average temperatures and rainfall across Clark County.
Additional mosquito trapping and testing will be conducted in the area where the positive mosquitoes were identified to monitor mosquito activity and determine whether West Nile virus is continuing to circulate.
“The identification of West Nile virus in local mosquitoes is a reminder that residents should take steps to protect themselves from mosquito bites,” said Dr. Cassius Lockett, district health officer for the Southern Nevada Health District. “Simple actions such as using insect repellent, eliminating standing water and wearing protective clothing can help reduce the risk of mosquito-borne illness.”
The Health District’s Fight the Bite campaign encourages residents to eliminate standing water around their homes, use an EPA-registered insect repellent and wear protective clothing.
Residents can report mosquito activity to the Health District’s surveillance program at 702-759-1633. Green pools can be reported to local code enforcement agencies.
West Nile virus is transmitted to people through the bite of an infected mosquito. Most people infected with the virus do not develop symptoms, according to the Health District.
Some people may experience fever, headache, body aches, joint pain, vomiting, diarrhea or rash. In rare cases, infection can lead to serious neurological illness.
In 2024, 26 human cases of West Nile virus were reported in Clark County. No human cases were reported in 2025.
Earlier this month, the Health District reported Clark County’s first human case of West Nile virus in 2026. The patient had traveled to another state where multiple human West Nile virus cases had been reported and was also present in Clark County during the incubation period.
The Health District is also monitoring the presence of Aedes aegypti, an invasive mosquito species capable of transmitting viruses such as Zika, dengue, yellow fever and chikungunya.
More information about mosquito surveillance is available at www.snhd.info/mosquito.
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