20 mosquito samples in Frisco examined constructive for West Nile


Twenty mosquito samples in Frisco have tested positive for the West Nile virus since May 1, and city officials are urging residents to combat the bite by draining stagnant water and using insect repellent.

In areas where positive samples have been taken, the city will step up surveillance and treatment with larvicides or adulticides to reduce mosquito populations. However, the city cannot treat private property, and residents cannot request that their neighborhood be treated, according to the city’s website.

Instead, Frisco residents are urged to help prevent mosquitoes by following four guidelines sponsored by the Texas Department of Health:

  • Use approved insect repellant every time you go outside. Approved repellants contain DEET, picaridin, or lemon eucalyptus oil. Follow the directions on the label.
  • Drain off stagnant water that builds up in bird baths, French drains, clogged gutters, saucers under potted plants, and the “splash blocks” at the end of the gutter spout. Mosquitoes that carry the virus breed in stagnant water.
  • Wear long sleeves and pants in the morning and evening light when the mosquitoes are most active.
  • Use air conditioning and make sure doors and windows are properly screened.

The mosquitos collected from a trap await examination at the Dallas County Mosquito Lab in early August.  Staff record the number, type and gender of each trap, and then send all female house mosquitoes to test for the West Nile virus.

No human cases have been reported in Frisco. However, Plano reported his first case of the West Nile virus in humans on September 3. In addition, Dallas County Health and Human Services has reported 15 cases of the West Nile virus in humans – including four deaths.

For more information on prevention and procedures, see Frisco’s Moscow Surveillance and Response Plan.

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