Power 5 optimism dwindling for on-time start to season

That's the assumption. That hasn't been tested. What is probably true is that social distancing is most effective with or without masking. Even with masking there are degrees of effectiveness. Not all masks offer equal effectiveness. To say if two people wear a mask one is protected from the other if one has COVID is not accurate without then getting into what kind of mask is in play and how close of proximity to each other they are. The study admits it doesn't get into it that intensely. So to make such blanket statements based on this study goes beyond what the study says. You are basically making certain assumptions which may be true but have not been scientifically established. Those countries you cite have been most successful could have been just as successful implementing social distancing guidelines with no masks. We really don't know and can't say for sure.
 
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