A Dallas resident in their early 50s has been diagnosed with the severe neuroinvasive form of West Nile Virus, marking the first confirmed human case in Dallas County this season.
Dallas County Health and Human Services announced the case Tuesday, Aug. 11, noting that 167 mosquito pools across the county have already tested positive for the virus. Sachse falls within Dallas County's surveillance area, so the positive pools and health warning apply directly to local residents.
The season started earlier than usual. The first positive mosquito pool was detected in March, well ahead of the typical April-through-mid-November monitoring window.
A more severe form
West Nile Neuroinvasive Disease, the form diagnosed in this case, can cause seizures, confusion and paralysis. Milder infections bring fever, headache and muscle aches. There is no vaccine or specific treatment.
DCHHS Director Dr. Philip Huang urged residents to take precautions, saying in the county's press release that the confirmed case is "an important reminder that West Nile virus is still active here in Dallas County. Take a few minutes to protect yourself from mosquito bites, especially when spending time outdoors."
Last year, Dallas County recorded 10 human cases and one death. That fatality, reported in early October 2025, was a 70-year-old man with underlying medical conditions who also had the neuroinvasive form, according to CBS News Texas. By that point in 2025, the county had logged 245 positive mosquito traps, compared with 167 already identified this August.
The "4Ds" for Sachse residents
DCHHS recommends four steps to reduce risk:
- DEET: Use EPA-registered insect repellent.
- DRESS: Wear long, loose, light-colored clothing outdoors.
- DRAIN: Dump standing water from flower pots, gutters and pet bowls where mosquitoes breed.
- DUSK TO DAWN: Limit time outside during peak mosquito-feeding hours.
Residents can track positive mosquito pools and updated case counts on the DCHHS Arbovirus Dashboard.
