Remember that in the beginning there was an enormous shortfall of the masks that were known to be effective in preventing respiratory disease. The CDC (and othe

Remember that in the beginning there was an enormous shortfall of the masks that were known to be effective in preventing respiratory disease. The CDC (and others) were very worried about medical personnel not being able to get them, very justifiably in hindsight. Just imagine how much worse the (already bad) panic buying of masks would have made it if the CDC had told everyone to mask up. We absolutely did not know that cloth masks would help. We (incorrectly) thought that anything less than a N95 mask would not help at all, and so that is what was communicated. Since then we have done a lot of science and have learned that while N95 masks are a lot better than, say, double-layered cloth masks, the latter are still much better than nothing in slowing down infection rates. We also were very focused on the effects for the wearer of masks. We were not focused on the effects of a possible spreader wearing the masks. Part of this was that all of the previous pandemics had diseases that people were symptomatic when they spread the disease. With Covid-19 we have a disease the mostly spreads when people are a-symptomatic. So the potential spreaders are the ones who most need to be wearing masks, and since we can't tell them apart, we need everyone in masks. All of these things are things we learned along the way. Harping on the CDC (or others) for not knowing them is just wrong. For some of the references here please see: https://www.wired.com/story/the-teeny-tiny-scientific-screwup-that-helped-covid-kill/ https://www.wired.com/story/the-teeny-tiny-scientific-screwu...