ANN ARBOR, Mich. (AP) — The University of Michigan announced major steps Friday to reduce the number of students on campus for the winter term because of the coronavirus, telling families that housing contracts will be canceled.

The university said undergraduates living in residence halls should not return after the holidays but participate in online classes from home.

Undergraduates who must live on campus will stay in single rooms, and weekly virus tests will be mandatory, the university said.

The winter term starts on Jan. 19.

There are 5,300 undergraduates in dorms this fall, down 45% from a typical year, as the university encouraged students to stay home for online classes.