This means that people who have young children and their parents are fully immunized, as well as friends and family members with weak immune systems, will need to be vigilant, especially in high-transmission areas. Not only will vaccinated Americans need to wear masks, but also to protect their family and friends.As of Thursday, there were 67,000 new cases per hour in the United States. Although they could be transmitting the Delta variant to others, they are likely to contribute to the rises in cases.The C.D.C. Experts who are interested in the reasons behind the C.D.C.'s decision to discontinue mask use have not been able to access the data yet. The research was cited by four scientists who were familiar with it. They said the findings were compelling and supported the C.D.C.'s recommendation that the vaccinated continue wearing masks in public indoor spaces.Scientists confirmed that the research was done by outsiders to the C.D.C. and that the agency is quickly analyzing and publishing the results. One official stated that the agency plans to publish the research Friday.The research could be partly related to the outbreak in Provincetown (Mass.) where there have been 882 cases of Fourth of July celebrations as of Thursday. Nearly three quarters of these people had been fully vaccinated.
