Wear a Mask! Just published in Nature Medicine: Respiratory virus shedding in exhaled breath and efficacy of face masks: "Our results indicate that surgical face masks could prevent transmission of human coronaviruses" https://www.nature.com/articles/s41591-020-0843-2">https://www.nature.com/articles/...
We don& #39;t need the scientific proof. It takes too long for action.