The University of Southern Maine barred from its campus last week students who weren’t doubly vaccinated against mumps, The New York Times reported.

In response to a mumps outbreak in the state, the Maine Center for Disease Control and Prevention had recommended that all college students have two documented doses of the measles, mumps, and rubella (MMR) vaccine. After two confirmed cases of mumps at Southern Maine, the state agency issued an emergency order that all 6,000 full-time and resident students on the university’s two campuses have two vaccinations, the Times reported.

Southern Maine set up clinics and gave several hundred shots, informing students that they would be barred from class and that their identification cards — required for entry to dormitories and dining halls — would be deactivated if they did not show proof of both immunizations by last Wednesday. Officials also issued lists of affected students to professors, directing them to send the students home, which some professors did, according to the Times.

By Friday afternoon, about 300 students still needed the second vaccination. Those who were allergic to it or otherwise medically exempt could still go to class, but those who objected for personal reasons were asked not to come to the campus for 18 days, the incubation period of the virus, the Times said.

Last year students on several campuses came down with the mumps, first on two campuses — the University of Kansas and Loras College — and later at three others — Benedictine College, the University of Virginia, and Wheaton College in Illinois. —Sara Lipka