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  CDC study shows three-fourths of people infected in Massachusetts coronavirus outbreak were vaccinated but few required hospitalization By  Carolyn Y. Johnson ,  Yasmeen Abutaleb  and  Joel Achenbach   July 30, 2021 at 6:35 p.m. EDT Commercial Street in Provincetown, Mass., on July 24. (Craig F. Walker/Boston Globe/Getty Images) A sobering  scientific analysis  published Friday found that three-quarters of the people infected during an explosive  coronavirus  outbreak fueled by the delta variant were fully vaccinated. The report on the Massachusetts cases, from the Centers for Disease Control and Prevention, offers key evidence bolstering the hypothesis that vaccinated people can spread the more transmissible variant and may be a factor in the summer surge of infections. The data, detailed in the CDC’s  Morbidity and Mortality Weekly Report , helped persuade agency scientists to reverse recommendations on mask-wearing and advise t...
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