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CDC's new masking guidance prompted by science that emerged in just the last several days, Walensky says

CNN
 2021-07-28

Cover picture for the article(CNN) — The CDC's decision to change its mask guidance this week was prompted by scientists' determination -- only days old -- that vaccinated people with breakthrough Delta coronavirus variant infections can pass the virus to others, the center's director said Wednesday. Dr. Rochelle Walensky said such breakthrough infections are...

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