Officials in Oakland County have reportedly found mosquitoes there that test positive for the West Nile Virus.
The Oakland County Health Division says mosquitoes in a trap tested positive for West Nile Virus.
The disease can pose serious problems for elderly people, potentially affecting their brain tissue.
The virus is passed through a bite from an infected mosquito.
Officials say there have not yet been any confirmed cases of West Nile in Oakland County this year.
But last year numerous incidents were reported in Michigan, including three confirmed cases in Oakland County, one that proved fatal.
Health officials say residents should try to protect themselves from mosquito bites by using insect repellent, wearing long pants and shirts with long sleeves and eliminating containers of standing water which are typical breeding sites for mosquitoes.