coronavirus August 3, 2021 7:00 am CDC: Barnstable Outbreak Proves Vaccines Work The U.S. Centers for Disease Control and Prevention confirmed that the spread of the coronavirus delta variant in Provincetown is one of the reasons they changed mask guidelines for vaccinated people. US & World Videos 2:36 Karen Read trial begins with opening statements Monday 2:09 Staffer at Kipp Academy in Lynn stabbed by student 1:49 Out-of-control truck smashes sign outside Mass. ice cream shop 3:26 More April showers on the way to Boston as May arrives 6:26 Father and son with contracting side hustles faced similar financial allegations