With COVID-19 cases surging just as students are about to return from winter break, dozens of U.S. colleges are moving classes online again for at least the first week or so of the semester — and some warn it could stretch longer if the wave of infection doesn’t subside soon.

Harvard is moving classes online for the first three weeks of the new year, with a return to campus scheduled for late January, “conditions permitting.” The University of Chicago is delaying the beginning of its new term and holding the first two weeks online. Some others are inviting students back to campus but starting classes online, including Michigan State University.

Many colleges hope that an extra week or two will get them past the peak of the nationwide spike driven by the highly contagious omicron variant. Still, the surge is casting uncertainty over a semester many had hoped would be the closest to normal since the start of the pandemic.

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