Mosquitoes carrying West Nile virus found in two more Louisville ZIP codes

August 26, 2022

Fogging operations to be conducted in specific neighborhoods

 The Louisville Metro Department of Public Health and Wellness (LMPHW) has found mosquitoes infected with West Nile virus in surveillance traps in two additional Louisville ZIP code areas: 40258 and 40272. Mosquitoes with West Nile were previously reported in ZIP codes 40203, 40206, 40208, 40211, 40212, 40214 and 40215. Additional traps recently caught positive mosquitoes again in ZIP codes 40203, 40206, 40208, 40211, and 40212.

Mosquito fogging has begun and will continue in the following areas weather permitting:

  • Portland
  • Irish Hills
  • Crescent Hill
  • River Park
  • Valley Downs

Fogging occurs between dusk and dawn. The Department of Public Health and Wellness uses Zenivex, a synergized synthetic pyrethroid, using an ultra-low volume fogging machine. This product offers a very low toxicity and odor. The U.S. Environmental Protection Agency and Kentucky Department of Agriculture recognize pyrethroids as safe to use without posing unreasonable risks to human health. Zenivex breaks down quickly in sunlight and does not have a residual effect.

West Nile mosquitoes are not unusual at this time of year.  People are advised to take the following precautions no matter what ZIP code they live in:

Avoid mosquito bites

  • Use insect repellents when you go outdoors. Repellents containing DEET, picaridin, IR3535 and some oil of lemon eucalyptus and para-menthane-diol products provide longer-lasting protection. To optimize safety and effectiveness, repellents should be used according to the label instructions. More information about insect repellents can be found here.
  • When weather permits, wear long sleeves, long pants and socks when outdoors. Mosquitoes may bite through thin clothing, so spraying clothes with repellent containing permethrin or another EPA-registered repellent will give extra protection. Don't apply repellents containing permethrin directly to skin. Do not spray repellent on the skin under your clothing.
  • Take extra care during peak mosquito biting hours of early morning and dusk. Be sure to use repellent and wear protective clothing from dusk to dawn or consider avoiding outdoor activities during these times.

Prevent mosquito breeding grounds

  • Install or repair screens on windows and doors to keep mosquitos outside.
  • Help reduce the number of mosquitoes around your home by emptying standing water from flowerpots, gutters, buckets, pool covers, pet water dishes, discarded tires and drain birdbaths on a regular basis.

No confirmed human cases of West Nile have been reported in Louisville so far this year. 

In most instances, people infected with West Nile virus either show no symptoms or relatively mild symptoms.  However, less than 1% of infected people develop a serious neurologic illness such as encephalitis or meningitis.  Serious illness can occur in people of any age. However, people over 60 years of age are at the greatest risk for severe disease. People with certain medical conditions, such as cancer, diabetes, hypertension, kidney disease and people who have received organ transplants are also at greater risk for serious illness.

To check if your area has been fogged or will be fogged call the mosquito hotline, 502-574-6641, or visit the department’s website. To make a complaint about mosquitos in your neighborhood call Metro Call at 311 or 502-574-5000.



Louisville Metro Department of Public Health and Wellness (LMPHW) is a nationally accredited, independent, academic health department committed to achieving health equity and improving the health and well-being of all Louisville residents and visitors. 


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