Mosquitoes test positive for West Nile virus in Jefferson County 

July 25, 2023

Fogging operations to be conducted in the Iroquois area  

LOUISVILLE, Ky. – (July 25, 2023) The Louisville Metro Department of Public Health and Wellness (LMPHW) has found mosquitoes infected with West Nile virus in surveillance traps in the Iroquois area. To help prevent infection and reduce the mosquito population, mosquito fogging will take place this week in the 40214 ZIP code. 

So far this year, no confirmed human cases of West Nile have been reported in Jefferson County.
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 at greater risk for serious illness.

“This is about the time of year we typically see mosquitoes test positive for West Nile,” said Louisville’s Interim Chief Health Strategist Connie Mendel. “No matter what ZIP code you live in, please take precautions to avoid being bitten.” 

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 a repellent containing permethrin or another EPA-registered repellent will give you extra protection. Don't apply repellents containing permethrin directly to your skin. Do not spray repellents 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 draining birdbaths on a regular basis.

To check if your area will be fogged, visit the department’s website or call the mosquito hotline, 502-574-6641. To make a complaint about mosquitos in your neighborhood, call Metro311 by dialing 311 or 502-574-5000.

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