There is not a single study in the entire world that has been produced during the pandemic, or especially before, that shows masks reduce infections by 80%.
This is the most comically bad misinformation I have ever seen. CDC has been reduced to outright lies.
This is the most comically bad misinformation I have ever seen. CDC has been reduced to outright lies.
https://twitter.com/CDCDirector/status/1456645731691925518
Asterisk* there has not been a single observational study or randomized trial.
Have there been some computer models to come up with 80% number by arbitrarily making assumptions ahead of time? Probably. But GIGO.
Have there been some computer models to come up with 80% number by arbitrarily making assumptions ahead of time? Probably. But GIGO.
Just to give you a heads up on how laughably bad this is, there have been two RCTs produced on masking with COVID-19. They found midpoints of 10-14% efficacy, neither of which found statistical significance to guarantee efficacy.
80% is not even in the universe of reality.
80% is not even in the universe of reality.
The chief public health official in the United States is getting ratio'd for her disinformation. Even if you believe her tweet (and God bless your heart for having such strong conviction in the face of reality if so), you have to admit this is a public health fail. 
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