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City sees first human case of West Nile Virus, will fog in area

Thursday, August 3 2017 3:45 PM

Tarrant County Public Health has notified the City of a confirmed human case of West Nile Virus in Colleyville near the intersection of Glade and Jackson roads.

In response to this case, the City of Colleyville is following recommendations from Tarrant County and will fog the surrounding area from 9 p.m. to 5:30 a.m. Friday, Aug. 4, and Saturday, Aug. 5. Crews will also add additional mosquito sample sites and apply larvicide around the area.

City staff is notifying affected residences with hand-delivered letters. Residents are encouraged to practice prevention tips by dressing in long-sleeved shirts and pants when outdoors, using insect repellants containing DEET, and draining standing water. This is the first human case reported in Colleyville this year.

The majority of people who become infected with the virus develop a very mild form of West Nile fever. Typical symptoms include a slight fever and muscle aches, lasting a few days. The most severe form of the virus may present symptoms such as headache, high fever, neck stiffness, disorientation, coma, tremors, seizures or paralysis.

For concerns or questions about this application please contact Public Works office at 817.503.1090.

Mosquito ULV Fogging / Adult Mosquito FAQs

  • Proper terminology is ULV (Ultra Low Volume) Fogging, not spraying
  • The active ingredient (permethrin) utilized for ULV fogging is commonly found in many household, pet, and livestock spray items
  • Product toxicity is actually much higher in homeowner products available through the feed store or hardware store. Mosquito products available widely for yard applications have from 32 to 110 times more concentration of active ingredient than the product used for ULV ground fogging
  • If able, pets should be brought indoors or put into a protected area. Outdoor water dishes should be emptied and refilled the next morning.
  • Poultry can be placed into henhouses or protected areas and allowed out, after daylight, the following morning
  • Homegrown produce grown in the response zone may be rinsed before consumption, but risk of contamination is extremely low
  • The nights of the application, ornamental fish ponds can be covered with tarps or plastic if located close to the roadway the fog trucks will be travelling. Coverings should be removed at daylight the following day.
  • Honey bee colonies can be covered after dark on the application nights with the covers promptly removed at dawn the following day. This material does not pose an issue for honey bees since the bees are not actively foraging while the application is taking place. As a side note, the material is precisely calibrated in a droplet size to impact an insect with the body mass of a mosquito and the material volatilizes after about five minutes. If some material happens to form residue on the ground or plants, the product is very rapidly degraded when exposed to UV light. 
  • Filters on air conditioning systems are sufficient to filter the product from the living space or car cabin, so please do not turn off the air systems. 
  • If you happen to drive behind a fog truck while in the operation of fogging, wait for the truck to pull over and pass promptly with the windows up and the air system on recirculate. 
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City of Colleyville | 100 Main Street, Colleyville, Texas 76034 | 817-503-1000 | Contact the city