DeKalb has a total of 25 mosquito traps, health board spokesman Eric Nickens said.
Most people infected with West Nile do not develop any symptoms, but some develop a bad fever and others can develop a severe illness.
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The emergence of West Nile virus can fluctuate year to year; last year, the first mosquitoes in DeKalb tested positive in mid-July, Nickens said.
To stop the spread of West Nile virus, health officials encouraged residents to eliminate standing water in gutters or other items, wear insect repellent and trim tall grass, weeds and vines.
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In other news:
Someone drove into two children playing in a DeKalb County neighborhood and then quickly drove off.