Mosquito Control Program

DCHHS Reports 13th Human Case of West Nile Virus
Dallas County Health and Human Services (DCHHS) reported the 13th human case of West Nile infection in Dallas County for the 2015 season on Sept. 3. The resident lives in the 75038 ZIP code in Irving and was diagnosed with West Nile Fever. DCHHS is awaiting confirmation of the case from the Texas Department of State Health Services. For medical confidentiality and personal privacy reasons, DCHHS does not provide additional identifying information.

West Nile Virus (WNV) is a disease that is spread by the bite of an infected mosquito. Mosquitoes can become infected when they feed on the blood from infected birds. The infected mosquitoes can then transmit WNV to humans and animals. Severe WNV infections can cause neurologic complications such as encephalitis. Milder symptoms include fever, headache and muscle aches. There is no vaccine or specific treatment for WNV.
The best way to avoid exposure to West Nile Virus is to avoid mosquito bites. Residents should use the 4Ds to reduce their risk:

  • DEET All Day, Every Day: Whenever outside, use insect repellents that contain DEET or other EPA-approved repellents and follow the product's instructions. 
  • Dress: Wear long, loose and light-colored clothing outside. 
  • Drain: Drain or treat all standing water in and around your home or workplace. 
  • Dusk and Dawn: Limit outdoor activities during dusk and dawn when mosquitoes are most active.
About the Program
Both the Federal Centers for Disease Control and Prevention (CDC) in Atlanta, and the Texas Department of State Health Services in Austin have written guidelines and regulations that relate to municipalities' and county governments' use of airborne pesticides which are truck-mounted sprayers or aircraft-mounted sprayers. This form of mosquito control is known as adulticiding, or killing adult mosquitoes.

Though most U.S. cities used adulticiding throughout the latter half of the twentieth century to reduce nuisance mosquitoes, those species that bite humans but normally don't carry disease. Nuisance spraying is heavily discouraged by state and federal health officials.
Irving's Mosquito Control Team Hits the Streets



The City of Irving's mosquito control team hits the street in the late night hours to spray neighborhoods.
Irving's Guidelines on Adulticiding
Irving has adopted the recommendations of the CDC when deciding when to send its vector control technician out at night to use the truck-mounted adulticiding unit. These guidelines are as follows:
  • When a particular trap location has over 100 female mosquitoes in one night of trapping.
  • When a mosquito pool, one trap's catch of mosquitoes, has tested positive for either West Nile Virus (WNV) or Saint Louis Encephalitis (SLE).
  • When the county or state health department reports a suspected human case of WNV or SLE in Irving.
  • When the county or state health department reports a confirmed human case of WNV or SLE in Irving.
Effects of Pesticide Use on Human Health
Effect on human health is one of the primary factors considered in regulation of pesticides. Pesticides that can be used for mosquito control have been judged by the EPA not to pose an unreasonable risk to human health. People who are concerned about exposure to a pesticide, such as those with chemical sensitivity or breathing conditions such as asthma, can reduce their potential for exposure by staying indoors during the application period, typically nighttime.