FILE - In this July 23, 2020, file photo, Weston Koenn, a graduate student from Los Angeles, leaves the Boston University student union building in Boston. The university is urging students to stay on campus for Thanksgiving or, if they go home, stay away for the rest of the semester, joining a growing number of U.S. universities working to curb the spread of the coronavirus around the holidays. (AP Photo/Charles Krupa, File)

FILE— In this July 23, 2020, file photo, a worker from Boston University's maintenance department carries a bottle of sanitizer, due to concerns over the COVID-19 virus outbreak, while making her cleaning rounds at a campus building in Boston. The university is urging students to stay on campus for Thanksgiving or, if they go home, stay away for the rest of the semester, joining a growing number of U.S. universities working to curb the spread of the coronavirus around the holidays. (AP Photo/Charles Krupa, File)