West Nile virus is transmitted through the bite of a mosquito that has picked up the virus by feeding on an infected bird or other animal.
The health agency says it bases its risk assessment model on temperature, mosquito surveillance data, and human cases from the previous year (2017).
And experts stress prevention, such as dumping standing water, wearing repellent and/or long sleeves and trousers when you're outside. "If you can avoid being out at dusk, that's usually when they prey more", said Cookman.
There have also been 22 human cases of West Nile confirmed to date for 2018 with two residents contracting the virus in the Will and DuPage County portions of Aurora.
However, it can develop into a severe illness and cause permanent damage to a person's central nervous system.
► Use DEET: Cover exposed skin with an insect repellent containing DEET, the most effective repellent against mosquito bites.
Dress - Wear loose-fitting, long sleeved shirts and trousers to reduce the amount of exposed skin. Always follow label directions.
Use screens on open windows and doors. She said sites that harbor water, such as flower pots, tarps or clogged gutters, are breeding grounds for mosquitoes.
Watch and listen to health department alerts and warnings about mosquito disease outbreaks.
Fliers are also being handed out to people alerting them that West Nile was found in the area and advising them on how to help prevent the spread of it.
Most people who become infected with WNV do not develop any symptoms.
Both cases are now pending confirmation testing through the Centers for Disease Control and Prevention. Four total cases have been reported in Kent County this year and one has been reported in Berrien County. A Pearl River County resident's infection was confirmed in July.
Fifty-three cases and two deaths have been reported in Louisiana, a CDC report shows.