More US colleges were grappling with high numbers of students testing positive for the coronavirus just days into the start of the fall semester after some universities rolled back their campus reopening plans in recent weeks. The University of Alabama on Monday reported more than 550 people across its campuses had tested positive for COVID-19 since it resumed in-person classes on August 19. Most of those infected were students, faculty and staff at the university’s main campus in Tuscaloosa. Citing a “dramatic increase” in coronavirus cases on campus, the mayor of Tuscaloosa issued an executive order on Monday ordering bars to shut down for 14 days and placing restrictions on other establishments. “Many students who tested positive for COVID-19 have chosen to go home to isolate,” Kellee Reinhart, the university’s vice chancellor for communications, told Reuters in an email. Reinhart said the school had an “ample amount” of space for COVID-19 positive students to isolate and that it was enhancing testing of various groups. The university has conducted more than 46,000 tests, according to a dashboard it released this week, and the positivity rate stood at about 1%. The number of positive cases does not include the 400 students who tested positive upon returning to University of Alabama campuses before classes began last week. Alabama is not alone in scrambling to deal with COVID-19 college outbreaks.