Denton County has confirmed its first human West Nile virus case of 2026, and the patient is a Denton resident. Denton County Public Health says the patient has the non-neuroinvasive form of the illness and is keeping further personal details under wraps. The case lands just as mosquito surveillance across North Texas has started turning up multiple West Nile-positive traps in recent weeks.
What officials are saying
Denton County Public Health identified the patient and characterized the infection as non-neuroinvasive, according to The Dallas Morning News. Juan Rodriguez, the county’s assistant public health director and chief epidemiologist, told the outlet that the jump in positive mosquito traps over the last few weeks points to a rising risk for human infection. County officials say they will keep up mosquito surveillance and will notify specific neighborhoods if and when targeted fogging is scheduled.
Where mosquitoes have tested positive
The county has already moved to truck-based fogging after a mosquito trap south of Hackberry and west of Frisco tested positive for West Nile virus, according to Denton County Public Health. Nearby, Frisco has confirmed two West Nile-positive mosquito pools and says it is increasing larviciding and surveillance in response, per the City of Frisco. Local reporting has also flagged a positive mosquito trap near Argyle in southern Denton County. County and city trap maps are being updated as lab results continue to come in.
How this fits into the statewide picture
The Texas Department of State Health Services confirmed the state’s first human West Nile case of 2026, a Harris County resident, on May 19. The agency notes that about 80 percent of infections cause no symptoms, while fewer than 1 percent progress to the neuroinvasive form of the disease. Over the past five years, Texas has recorded nearly 1,000 West Nile cases and 106 related deaths, with 2024 standing out as the deadliest year in that span. Health officials say that mosquito surveillance, including testing mosquito pools and tracking human cases, is the key early warning system for when targeted control measures are needed.
How to protect yourself
Public health agencies are pushing a familiar playbook. They recommend using an EPA-registered insect repellent, wearing long sleeves and pants during dawn and dusk, keeping windows and doors properly screened, and dumping out standing water where mosquitoes like to breed. Dallas County Health and Human Services has urged residents to follow the "4 D’s" and has scheduled targeted spraying in areas where positive samples turned up, according to the county’s press release. Frisco officials say larviciding will ramp up in affected neighborhoods. There is no vaccine for people, so personal protection and getting rid of mosquito breeding sites remain the primary defenses, according to the CDC.
Where to get updates
Denton County maintains an online West Nile information page with trap maps and fogging schedules and will post neighborhood spray maps when crews are deployed. For statewide case numbers and guidance, residents can check the Texas Department of State Health Services along with the CDC’s West Nile resources.
