A person reads a book on campus at the University of Southern California as the spring semester begins remotely amid concerns over the new omicron variant in Los Angeles, Calfornia, USA, 11 January 2022. Students and staff are required to get their COVID-19 vaccine booster shots and proof of a negative COVID-19 test to return to classes in-person starting 18 January 2022. (Photo by Caroline Brehman/EPA/EFE)
