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cdc-shares-pivotal-discovery-on-covid-19-breakthrough-infections-that-led-to-new-mask-guidance

CDC shares 'pivotal discovery' on Covid-19 breakthrough infections that led to new mask guidance

A new study shows the Delta Covid-19 variant produced similar amounts of virus in vaccinated and unvaccinated people if they get infected -- illustrating a key motivation behind the federal guidance that now recommends most fully vaccinated Americans wear masks indoors.
Read more on: cnn.com