This interview is clarifying, and a little infuriating. It's the best explanation I've seen for why the public health messaging has seemed so flummoxed. statnews.com/2021/07/23/how… 
On putting the masks back on indoors
For people who have been vaccinated, probably the most important question right now is whether and how likely it is that a breakthrough infection they contract could spread to someone in their life who hasn't been vaccinated, like a young child or grandchild...
It'd be nice if US public health authorities were tracking the data that would enable them to provide a quantitative answer to that question.
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