Young people now make up the majority of new COVID-19 cases in Michigan.
Over the last month, people under 40 have accounted for 60-percent of all new cases.
The biggest jump is among people between ages 20 and 29.
Neil Mehta is a health policy professor at the University of Michigan. He says young people are doing less social distancing and that means universities need to "rethink" opening in the fall.
"Bringing large numbers of students into one place just gives more opportunities for folks to congregate, and increases the risk of these super-spreading events that we saw in East Lansing and we saw in other places in the country."
Mehta says enforcing social distancing measures, like having police break up large parties, may have to be considered.
