Counties where large colleges and universities opened for in-person classes in the fall suffered a significant rise in the incidence of Covid-19, according to a new study from the CDC. Within three weeks of colleges or universities opening to in-person instruction, counties that were home to these institutions "experienced a 56% increase in incidence," … Meanwhile, the researchers found that incidence decreased by 5.9% in counties without universities and by 17.9% in those with universities that held remote classes.