A Salt Lake County resident has tested positive for West Nile virus, the Salt Lake County Health Department confirmed Thursday, July 30, marking the county's first human case of 2026 in a year when mosquito-borne detections are running far ahead of recent summers.

The infected adult is expected to make a full recovery, according to KUTV. It is the second confirmed human case statewide this year, following one reported in Bear River in late June.

The numbers tell the story. Three Salt Lake County mosquito abatement districts have found the virus in 86 mosquito samples countywide so far in 2026. Statewide, that number is 296. At the same point last year, only 39 samples had tested positive across all of Utah. In 2024, just 18 had.

The health department warned that because mosquitoes can travel several miles, all county residents should take precautions regardless of where they live. The department also noted that actual infections are likely more widespread than case counts suggest, since only 20 to 30 percent of infected people develop any symptoms at all.

Why it matters locally

No source has confirmed whether any of the 86 positive mosquito samples were collected within Millcreek city limits specifically. But Millcreek sits squarely within Salt Lake County's mosquito abatement coverage area, and the health department's guidance applies countywide.

Last year, 49 Utahns were confirmed to have contracted West Nile virus. Thirty-nine developed the neuroinvasive form of the disease, and four died.

What Millcreek residents should do

The Salt Lake County Health Department recommends these steps, especially after dusk when mosquitoes are most active:

• Use EPA-registered repellents containing DEET, picaridin, IR3535, or oil of lemon eucalyptus.
• Wear long sleeves and pants during evening hours.
• Drain standing water in yards: old tires, potted plant trays, pet dishes, toys, and buckets.
• Keep roof gutters clear and cut weeds and tall grass short, since adult mosquitoes rest in shady spots during the day.
• Check window and door screens for holes or gaps.

Residents can find their local mosquito abatement district at umaa.org/districts. Mosquito season continues until the first hard freeze, according to KSL NewsRadio.

Symptoms to watch for

Most people infected with West Nile virus never know it. About one in five develop fever, headaches, body aches, vomiting, diarrhea, or rash, with fatigue sometimes lasting weeks. Roughly one in 150 develop severe illness such as encephalitis or meningitis. Older adults and immunocompromised individuals face the highest risk. There is no vaccine or specific treatment.

Symptoms appear two to 14 days after a mosquito bite.