The Centers for Disease Control and Prevention said Friday that schools can safely open as long as a range of precautions are in place, offering a road map for a return to classrooms that in parts of the country have been shuttered for nearly a year. When infection rates in the community are higher, the agency recommends shifting to a combination of in-person and remote learning to minimize the number of people in school buildings at any given time. Fully remote learning is recommended only in certain cases when virus rates are very high. And while the CDC reiterated that states should prioritize teachers for vaccination, the agency said it is not a prerequisite for reopening.