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The CDC reversed the relaxed mask recommendation on July 27, 2021 when breakthrough infections were discovered.

The timeline for Delta and mask guidance...

May 11, 2021: Delta is named a "Variant of Concern" by the WHO.

May 13: The CDC relaxed the mask rules for the fully vaccinated recommending those fully vaccinated can discontinue wearing masks indoors.

May 19: In an interview Fauci stated the public was misinterpreting the CDC mask guidance.

July 13: Delta became the dominant strain in the U.S. with over 50% of the cases.

July 27: the CDC reversed the previous mask guidance and recommended the fully vaccinated resume wearing masks indoors...

CDC shares 'pivotal discovery' on Covid-19 breakthrough infections that led to new mask guidance
https://www.cnn.com/2021/07/30/health/breakthrough-infection-masks-cdc-provincetown-study/index.html

On Tuesday, Walensky previewed these findings while unveiling guidance that people in areas with "high" or "substantial" Covid-19 transmission should resume wearing masks indoors. Over 75% of the US population live in these areas.

The finding that the Delta variant resulted in similar viral loads "was a pivotal discovery leading to CDC's updated mask recommendation," Walensky said Friday.

Fauci says the public is ‘misinterpreting’ the CDC’s latest mask guidance
https://www.washingtonpost.com/nation/2021/05/19/coronavirus-covid-live-updates-us/

Anthony S. Fauci, the government’s leading infectious-disease expert, told Axios that the public is misinterpreting the Centers for Disease Control and Prevention’s announcement last week that fully vaccinated people can go without masks indoors.

“I think people are misinterpreting, thinking that this is a removal of a mask mandate for everyone. It’s not,” he told Axios. “It’s an assurance to those who are vaccinated that they can feel safe, be they outdoors or indoors.”

Fauci emphasized that the health agency did not explicitly tell unvaccinated people to go without masks but instead communicated to vaccinated individuals that they will not get infected indoors or outdoors.

“People either read them quickly, or listen and hear half of it. They are feeling that we’re saying: ‘You don’t need the mask anymore.’ That’s not what the CDC said,” he told the news outlet.

Reaction to the CDC’s guidance has been applauded by those who say it shows the efficacy of vaccinations against the coronavirus and criticized by those who say it is too soon to forgo masks.

https://www.healthline.com/health-news/delta-variant-went-from-causing-10-to-over-50-of-covid-19-cases-what-happens-now

https://www.cnbc.com/2021/08/06/covid-charts-show-how-far-delta-variant-has-spread-around-the-world.html