Las Vegas mosquitoes test positive for West Nile virus, health officials say

Caitlin Lilly, Las Vegas Review-Journal on Jun 24, 2026

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LAS VEGAS — The Southern Nevada Health District announced Wednesday that it has identified the first mosquitoes of the season to test positive for West Nile virus in the Las Vegas Valley.

According to the agency, the mosquitoes were collected in the 89121 ZIP code as part of the Health District’s ongoing mosquito surveillance program. The Health District followed up later Wednesday morning, saying that mosquitoes in two additional ZIP codes, 89169 and 89139, have tested positive for West Nile virus.

“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.”

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