News Flash


Posted on: September 11, 2020

Two Mosquito Pools Test Positive for West Nile Virus; City to Increase Surveillance

(September 11, 2020) The City of Frisco will increase surveillance after receiving confirmation that two mosquito pools tested ’positive’ for West Nile Virus (WNV). Due to the most recent rains no treatment will be scheduled for application at this time; however, the surveillance process includes looking for increased areas of stagnant water that may support mosquito breeding.

The city is increasing surveillance efforts in public areas along Hickory Street near Oakbrook Park (see map) and North County Road near Warren Sports Complex (see map).  

“In response, staff will be observing these areas more closely,” said Julie Fernandez, Environmental Health Supervisor. “The increased eyes on the situation will help us identify any potential breeding grounds. At that time, we would apply treatment.” 

The City of Frisco supports four precautionary habits, commonly referred to as the 4Ds, promoted by the Texas Department of State Health Services.

  • DEET: Use approved insect repellents every time you go outside. Approved repellents contain DEET, picaridin or oil of lemon eucalyptus. Follow label instructions.
  • DRAIN: Drain standing water that collects in bird baths, French drains, clogged gutters, saucers under potted plants and ‘splash blocks’ (at end of gutter down spout). The mosquitoes that carry WNV can breed in stagnant water.
  • DRESS: Wear long sleeves, pants at dawn and dusk (when mosquitoes are most active).
  • DAWN/DUSK: Use air conditioning. Make sure doors and windows are screened – and those screens are intact.

No human cases of the virus are confirmed in Frisco. These ‘positive’ pool confirmations bring the total to twelve in Frisco this year. 

In accordance with its Mosquito Surveillance and Response Plan, Frisco began testing for mosquitoes May 1. For more information on the city’s plan, visit or contact the City of Frisco’s Health & Food Safety Division at 972-292-5304

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