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CDC reversal on indoor masking prompts experts to ask: Where’s the data? As the coronavirus delta variant spreads, the significance of breakthrough infections remains unclear. By Joel Achenbach, Yasmeen Abutaleb, Ben Guarino and Carolyn Y. JohnsonThe Washington Post Share New recommendations from federal health officials this week on when vaccinated Americans should don face masks came with a startling bolt of news: People who have had their shots and become infected with the delta variant of the coronavirus can harbor large amounts of virus just like unvaccinated people. That means they could become spreaders of the disease and should return to wearing masks indoors in certain situations, including when vulnerable people are present.

United statesUnited kingdomFred hutchinson cancer research centerKristen nordlundRobert wachterAnthony fauciWilliam hanageJames musserPaul offitRochelle walenskyLarry coreyGregg gonsalvesRavindra guptaCenters for diseaseResponse teamEmory university rollins school of public health