LANSING, Mich. (AP) — The first West Nile virus cases of the year in Michigan have been found in residents in Oakland and Macomb counties, according to the state health department.

Wayne, Macomb, Oakland, Bay, Kent, and Midland counties, along with the city of Detroit had positive results in the past week for mosquitoes tested for West Nile virus and Jameson Canyon virus. A deer in Livingston County tested positive for eastern equine encephalitis.

Most people who have contracted West Nile have no symptoms. The Center for Disease Control and Prevention says 1 in 5 infected individuals infected will have a fever, headache, fatigue and possibly other side effects, but 1 in 150 people will develop a severe illness such as encephalitis or meningitis, which can be fatal.

Similarly, the CDC says many people infected with Jameson Canyon will have no symptoms, but some may experience a fever and other symptoms or more severe illnesses such as encephalitis or meningitis.