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Study: Vaccinated people can carry as much virus as others

The authors say the findings suggest the CDC’s mask guidance should be expanded to include the entire country.
Credit: AP
FILE - In this July 19 2021 file photo, employees check out customers at 2nd Street second hand store in the Fairfax district of Los Angeles. New evidence showing the delta variant is as contagious as chickenpox has prompted U.S. health officials to consider changing advice on how the nation fights the coronavirus. Recommending masks for everyone and requiring vaccines for doctors and other health care providers are among measures the Centers for Disease Control and Prevention is considering, Friday, July 30. (AP Photo/Marcio Jose Sanchez, File)

WASHINGTON — In another big setback for the nation’s efforts to stamp out the coronavirus, scientists who studied a big COVID-19 outbreak in Massachusetts concluded that vaccinated people who got so-called breakthrough infections carried about the same amount of the coronavirus as those who did not get the shots. 

Health officials on Friday released details of that research, which was key in this week’s decision by the Centers for Disease Control and Prevention to recommend that vaccinated people return to wearing masks indoors in parts of the U.S. where the delta variant is fueling infection surges. 

The authors say the findings suggest the CDC’s mask guidance should be expanded to include the entire country.