UMMS helps gather data leading to eased CDC guidelines for fully vaccinated individuals Project followed health care workers who received COVID-19 test By Jim Fessenden May 26, 2021 Preliminary data published this month from a surveillance project conducted at UMass Medical School, evaluating the effectiveness of the Pfizer-BioNTech and Moderna vaccines, played a critical role in new guidelines by the Centers for Disease Control and Prevention that no longer require fully vaccinated individuals to wear masks indoors or to socially distance from others. On ...