A mosquito trap in Drumbo tested positive for the virus during routine surveillance.
There was one human case of West Nile virus in Oxford County in 2017.
Public Health officials say West Nile Virus is mainly transmitted to people through the bite of an infected mosquito.
"Positive and suspected West Nile cases are a reminder that preventative measures are important", said Dr. Faisal Khan, director of the department.
Health officials are urging residents to take steps to protect themselves from mosquito bites after Indiana's first human case of West Nile virus in 2018 was detected. They can be infected when they feed on the blood of infected birds. The Health Unit has been trapping and testing mosquitoes since June. Of the 26 Dallas County residents infected past year, two died from the mosquito-borne illness.
July and August are the times people are most at risk of contracting West Nile virus.
Dusk and dawn are when mosquitoes are most active.
DCHHS recommends that Dallas County residents use an insect repellent containing DEET whenever they go outside, and that they dress in long, loose and light-colored clothing. He's a Dallas native and a graduate of the University of North Texas.