Denton County's Second West Nile Case This Season Is the Neuroinvasive Kind

Denton County now has two confirmed human West Nile cases for 2026, and the second one is the form that worries doctors most.

A Colony resident has become Denton County's first confirmed human case of neuroinvasive West Nile virus this season, according to Denton County Public Health. That announcement came after a separate Denton resident was diagnosed with the non-neuroinvasive form, a case the county disclosed on July 10. The total human case count now sits at two.

Here's the distinction that matters. Most West Nile infections are either silent or feel like a rough flu. In rare cases, the neuroinvasive form attacks the nervous system directly — think meningitis, encephalitis, or acute flaccid myelitis. That outcome affects less than 1% of people infected. But for those who develop severe illness involving the central nervous system, the CDC puts the fatality rate at about 10%.

Timing is worth noting. August is one of the most active months for West Nile transmission, according to CDC data. The virus doesn't travel person to person. Mosquitoes pick it up by feeding on infected birds, then pass it along when they bite humans — which means every yard with standing water and active mosquitoes is part of this story, including southern Denton County, where a positive mosquito trap near Argyle has already been flagged.

Residents over 50 and those with compromised immune systems face a higher risk of severe illness. For everyone else, the odds stay low. Prevention, though, is both simple and free.

No vaccine exists, and there's no medication to treat West Nile once you have it — so not getting bitten is the whole strategy. A few things that actually work:

• Wear long sleeves and pants and use insect repellent containing DEET, picaridin, or oil of lemon eucalyptus.
• Mosquitoes bite day and night but peak at dusk and dawn; health officials recommend staying inside or covering up during those windows.
• Dump standing water anywhere it collects on your property — that's where mosquitoes breed.

Denton County keeps a 2026 interactive mosquito map alongside its case count at dentoncounty.gov/790/West-Nile-Virus, updated as new trap results come in. If you have a bird bath that hasn't been emptied in a week, a clogged gutter, or a low spot that holds water after rain, start there. The county can fog unincorporated areas. Your property is yours to manage.