Mosquitoes carrying West Nile virus have already been trapped in multiple locations across Davis County this summer, and statewide infection numbers are running nearly eight times higher than a year ago.
The Davis Mosquito Abatement District confirmed on its website that West Nile virus has been detected in traps during the 2026 season. The district, which serves Bountiful, Woods Cross, North Salt Lake, Farmington, and the rest of Davis County, operates about 60 traps countywide and had already found the virus in multiple mosquito pools by late June.
The local detections come as Utah's statewide numbers have risen sharply. As of Thursday, July 30, mosquito abatement districts across Utah had recorded 296 positive West Nile virus samples, according to KSL. At the same point in 2025, only 39 samples had tested positive. In 2024, the figure was 18. State data does not indicate whether expanded trapping effort contributed to the higher count.
Salt Lake County confirmed its first human case of the season on Thursday, July 30, ABC4 reported. The infected adult is expected to recover fully. It was Utah's second confirmed human case of 2026, following one reported in the Bear River area in late June.
Why it matters locally
Because mosquitoes can travel several miles, health officials say residents throughout Davis County face risk regardless of whether a positive trap sits on their block. The virus was first detected in Utah in 2003 and remains the leading cause of mosquito-borne disease in the continental United States, according to the CDC.
Last year, 49 Utahns contracted West Nile virus. Thirty-nine of those cases were the neuroinvasive form, which attacks the brain or spinal cord, and four people died. No deaths were reported in 2024.
Human cases typically lag mosquito detections by several weeks, meaning the full toll of the 2026 surge may not be clear until later this summer and into fall. The virus season continues until the first hard freeze.
Who is most at risk
About 80% of people infected with West Nile virus develop no symptoms at all. One in five will experience fever, headache, body aches, or rash. Roughly one in 150 develop severe illness such as encephalitis or meningitis. Adults over 50 and people with weakened immune systems face the highest risk of serious complications.
There is no vaccine or specific treatment.
What residents should do now
The Salt Lake County Health Department and state officials recommend these steps:
- Use EPA-registered repellent containing DEET, picaridin, IR3535, or oil of lemon eucalyptus.
- Wear long sleeves and pants after dusk, when mosquitoes are most active.
- Drain standing water from yards: old tires, plant trays, pet dishes, toys, buckets.
- Keep roof gutters clear of debris.
- Ensure door and window screens are intact.
- Cut weeds and tall grass short so mosquitoes have fewer shady resting spots.
- Stock garden ponds with mosquito-eating fish or use mosquito dunks.
Local resources
The Davis Mosquito Abatement District updates its West Nile virus testing results every Friday at davismosquitoutah.gov. Testing runs from June through September.
Residents can request fogging, report a neglected swimming pool, or schedule a property inspection by calling 801-544-3736 or visiting the district's website.
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