I guess strictly speaking is was the official position of the US government, but not the CDC: https://www.latimes.com/science/story/2021-07-27/timeline-cdc-mask

I guess strictly speaking is was the official position of the US government, but not the CDC: https://www.latimes.com/science/story/2021-07-27/timeline-cdc-mask-guidance-during-covid-19-pandemic https://www.latimes.com/science/story/2021-07-27/timeline-cd...