A growing number of colleges and universities are making changes to the beginning of the 2022 spring semester as a result of the surge in cases of Covid-19.
Duke University is extending its plan for remote classes by another week due to an "incredibly high" positive case count among faculty and students who are already in the area, the school announced on Friday.
The school previously announced that classes would be remote until Jan. 10. The policy applies to undergraduate, graduate and professional school classes, the school said.
Michigan State University said classes will start remotely on Jan. 10 and stay remote for three weeks, according to an announcement on Friday. Residence halls will still be open for students who wish to move back to campus.
"I realize that students prefer to be in person, and so do I," said university president Samuel Stanley, Jr. in his letter to students. "But it is important that we do so in a safe manner. Starting the semester remotely and de-densifying campus in the coming weeks can be a solution to slowing the spread of the virus."
Michigan State also said a decision will be made in the coming days as to whether booster shots will be required. Vaccination against Covid-19 is already required.
There are now more than 30 colleges and universities either moving classes online or pushing back the start of the semester entirely, including Columbia University, Princeton University, Harvard University, and Yale University.
CNN's Taylor Romine contributed to this report.