The C.D.C.’s initial guidance in May said people fully protected from the coronavirus could go mask-free indoors, but recommended that unvaccinated people still wear masks. Those recommendations drew sharp criticism from some experts, who said it was premature given the vast swaths of unvaccinated people in the country.
Dr. Rochelle Walensky, the C.D.C.’s director, at the time pointed to two scientific findings as significant factors. Few vaccinated people become infected with the virus, and transmission seems rarer still, she noted; and the vaccines appear to be effective against all known variants of the coronavirus.
This new guidance is a reverse from previous reversals of reversals and guidance.
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