@andyaschmidt @EricTopol @PNASNews @g_leech_ A lot of spread happens where people aren't wearing masks, so the reduction is much larger in places where they are to get a 19% average. So getting people masked up in pharmacies, transit, workplaces, etc. reduces risk to people who have to be there by much more than 19%.
@andyaschmidt@EricTopol@PNASNews@g\u leech\u很多传播发生在人们不戴口罩的地方，因此在他们想要获得19%平均值的地方，减少的幅度要大得多。因此，让人们在药店、交通工具、工作场所等处蒙面，可以将不得不去那里的人的风险降低19%以上。