5 year study on face masks published yesterday in Nature. On this evidence EVERYONE in hospital should wear a face mask. And everyone on a bus or train. The data is in this thread. https://www.nature.com/articles/s41591-020-0843-2
Respiratory virus shedding in exhaled breath and efficacy of face mask

A study of 246 individuals with seasonal respiratory virus infections randomized to wear or not wear a surgical face mask showed that masks can significantly reduce detection of coronavirus and...

https://www.nature.com/articles/s41591-020-0843-2
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