Not just US authorities, but WHO[1]. [1] https://www.cnn.com/2020/03/30/world/coronavirus-who-masks-recommendation-trnd/index.html https://www.cnn.com/2020/03/

Not just US authorities, but WHO[1]. [1] https://www.cnn.com/2020/03/30/world/coronavirus-who-masks-recommendation-trnd/index.html https://www.cnn.com/2020/03/30/world/coronavirus-who-masks-r...