The treatment is meant to decrease the mosquito population and minimize the risk of transmission of West Nile Virus.
The Saint Louis County Department of Public Health has recorded its first human case of West Nile virus this year.
Also, one positive mosquito pool with 11 mosquitos tested positive for WNV in a pool located in West Brant.
The product used will be a mosquito pesticide called Zenivex E20, which kills adult mosquitoes, but is not harmful to people and pets.
The health district said mosquito testing, which began in June is expected to continue through the late fall.
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Limit outdoor activities during dawn and dusk, when mosquitoes are most active. This follows last week's positive test result in Woodstock.
Between 70 percent and 80 percent of people that become infected with West Nile Virus do not develop any symptoms.
Wear long, loose and light-colored clothing. Only about 20 percent of those who come in contact with West Nile virus exhibit any symptoms, according to the Centers for Disease Control and Prevention.
Drain any standing water in your yard.
Use insect repellent containing DEET when outside. By the end of mosquito season in October, 26 Dallas County residents had reported infections, leading to two deaths.