It also conducted viral testing of those who showed covid-19 symptoms and found 139 cases among students, faculty and staff over the semester.
With funding tight, some schools conduct far less viral testing than others.
Mitchell E. Daniels Jr., president of the 45,000-student public university in Indiana, said the early green light helped enormously for faculty and staff to plan.
The university worried students would be far less likely to follow safety protocols if they did not have classes on campus.
It relied on student leaders, including members of fraternities and sororities, to help promote public health off campus.