As infections rise, C.D.C. urges some vaccinated Americans to wear masks again SECTIONS As infections rise, C.D.C. urges some vaccinated Americans to wear masks againBy Apoorva Mandavilli, New York Times Last Updated: Jul 28, 2021, 09:15 AM IST Share Synopsis CDC officials also called for universal masking for teachers, staff, students and visitors in schools, regardless of vaccination status and community transmission of the virus. With additional precautions, schools nonetheless should return to in-person learning in the fall. Agencies Revising a decision made just two months ago, the Centers for Disease Control and Prevention said on Tuesday that people vaccinated against the coronavirus should resume wearing masks in public indoor spaces in parts of the country where the virus is surging.