Previously, students could decide if they wanted to report their vaccine status to the university.
John Lucas, spokesperson for UW-Madison said about one-third of current students have voluntarily provided vaccine information to date.
Lucas said UW-Madison is the only Big Ten school without a disclosure requirement.
No other Universities of Wisconsin campuses require students to be vaccinated against measles or provide their vaccination status.
In a statement to WPR, system spokesperson Mark Pitsch said, “In recent months, there have been ongoing discussions about MMR vaccination and disclosure.”