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Mask mandates return to US college campuses as cases rise

Students walking the quad wear protective face masks as classroom mask mandates remain in place at Columbia University, Thursday, April 21, 2022, in the Manhattan borough of New York. (AP Photo/John Minchillo) Signs indicating that protective face masks must be worn in classrooms are displayed outside lecture halls at Columbia University, Thursday, April 21, 2022, in the Manhattan borough of New York. (AP Photo/John Minchillo) Signs indicating that protective face masks must be worn in classrooms are displayed outside lecture halls at Columbia University, Thursday, April 21, 2022, in the Manhattan borough of New York. (AP Photo/John Minchillo)