Denton County Public Health announced the confirmation of a fifth human case of West Nile virus on Thursday. The latest diagnosis involves a resident of southeast unincorporated Denton County who contracted the neuroinvasive form of the disease. This individual represents the fourth person to develop the severe form of the virus during the current 2026 mosquito season.
Earlier in July, a resident of Denton was diagnosed with the non-neuroinvasive form.
According to the Centers for Disease Control and Prevention, fewer than 1% of West Nile virus infections progress to the neuroinvasive stage. Among those who develop severe illness affecting the central nervous system, approximately 10% of cases result in death. The virus is transmitted to humans through the bite of an infected mosquito that has previously fed on an infected bird.
Juan Rodriguez, assistant director and chief epidemiologist for Denton County Public Health, stated that the agency is reminding the community of the ongoing risk due to continued mosquito activity and the confirmed cases. Rodriguez noted that there are currently no vaccines or medications available to prevent the disease, making the avoidance of mosquito bites the primary method of protection.
The county has outlined specific measures for residents to reduce their risk. These recommendations include avoiding outdoor activities during dusk and dawn, wearing long sleeves and pants, and applying insect repellent containing DEET, picaridin, or oil of lemon eucalyptus. Residents are also advised to eliminate standing water on their properties.
