Mumps, pertussis and other diseases are a growing concern in Washtenaw County because many children haven't been vaccinated against them.
Washtenaw County places 66th out of Michigan's 84 counties for fully-vacinated children between the ages of 13 and 17.
Washtenaw County Public Health Medical Director Alice Penrose says some diseases that aren't common are starting to come back and could become a major problem.
"Ohio has had both mumps and measles epidemics fairly recently," Penrose says, "and there's obviously a lot of travel between here and Ohio."
Penrose says they are working with all of the different practices in the county to help ensure more children receive vaccinations.