LAS VEGAS (FOX5) — The Southern Nevada Health District reported Thursday that 10 additional mosquito pools that have tested positive for West Nile virus, bringing the season total to 14 positive pools in Clark County.
The newly identified positive pools were detected in ZIP codes 89117, 89121, 89142 and 89146.
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The update follows a statement from the Centers for Disease Control and Prevention reporting that West Nile virus activity is occurring earlier than usual across the country. As of June 30, 2026, 23 states have reported West Nile virus activity, and the number of human cases reported at this point in the year is the highest since 2004.
“These additional positive mosquito pools are a reminder that West Nile virus activity is increasing in Southern Nevada,” said Dr. Cassius Lockett, District Health Officer for the Southern Nevada Health District. “As many people plan to spend time outdoors during the holiday weekend, we encourage everyone to take simple precautions to prevent mosquito bites.”
Most people infected with West Nile virus do not develop symptoms. Approximately one in five people develop a fever with symptoms that may include headache, body aches, joint pain, vomiting, diarrhea or rash. Less than 1% of infected people develop severe neurologic illness, including encephalitis or meningitis.
Adults 60 and older and people with weakened immune systems are at greater risk for severe illness.
How to protect yourself
The Health District recommends the following steps to reduce the risk of mosquito bites:
- Use an EPA-registered insect repellent
- Wear long sleeves and pants when outdoors, especially at dawn and dusk
- Remove standing water around homes and businesses where mosquitoes can breed
- Ensure window and door screens fit properly
Residents can monitor local mosquito surveillance activity at southernnevadahealthdistrict.org/programs/mosquito-surveillance/arbovirus-update.
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