A Flower Mound Resident Is Denton County's First Confirmed Human West Nile Case of 2026

If you've been skipping the bug spray for your evening walk around Heron's Bay or along the trail at Heritage Park, this is the nudge to stop doing that.

Denton County Public Health has confirmed the first human West Nile virus case of the year in the county — a Flower Mound resident diagnosed with West Nile Neuroinvasive Disease. No personal information has been released to protect patient confidentiality.

Neuroinvasive is the more serious form of the illness. Rare, but worth knowing. Less than 1% of people infected with West Nile develop the neuroinvasive form, which can involve fever, severe headaches, confusion, tremors, convulsions, or paralysis. About 1 in 5 people who contract West Nile at all will even become symptomatic. Most people who get infected never know it.

"As mosquito traps in Denton County have become more active over the summer, we are now seeing our first human case of West Nile Virus," said Juan Rodriguez, DCPH Assistant Director and Chief Epidemiologist.

The traps have been busy. Five mosquito traps in Denton County tested positive for West Nile virus early in the 2026 mosquito season. After a trap south of Argyle came back positive, the county conducted ground fogging in that area. As of July 16, Denton County had scheduled ground fogging on five occasions this year.

What actually works

There are no medicines to cure or vaccines to prevent West Nile virus, so not getting bitten is the whole game. The standard playbook is short.

• Mosquitoes are active around the clock, but the hours around dusk and dawn are when they feed most aggressively — so health officials suggest staying indoors or limiting exposure during those windows.
• When you are outside, wear long sleeves and long pants and use an insect repellent containing DEET, picaridin, or oil of lemon eucalyptus.
• Drain standing water near your home, or use BTI briquettes — sold as "mosquito dunks" — for water that can't be drained. Gutters, plant saucers, buckets, bird baths: empty them weekly. Mosquitoes need only two tablespoons of water to breed.
• If you develop symptoms, the CDC recommends contacting a local healthcare provider. Fever, headache, and body aches showing up a few days after a bite are the things to flag.

Where to track it

Denton County Public Health maintains a dedicated West Nile page at DentonCounty.gov/WNV where you can pull up mosquito maps and dig into the details on the virus. The county's surveillance map shows all mosquito trap results countywide, including which locations have tested positive, and new data is added as it's collected and processed. Worth bookmarking if you have kids playing outside or spend time in a yard that borders any kind of drainage or low-lying green space — which, around Flower Mound, is a lot of yards.

Cases peak in summer through early fall, with August historically one of the most active months. The season isn't over. It's just getting started.