A CDC report finds U.S. counties with large colleges or universities experienced a 56% increase in COVID-19 cases after starting in-person classes this fall. College students can unintentionally spread COVID-19 to friends and relatives who could be more at risk of becoming seriously ill. Students, faculty, and staff should wear a mask, stay 6 feet apart, and avoid gatherings to slow the spread. Learn more: https://bit.ly/MMWR1721.