美國衛生局又說不要戴口罩

The CDC is not recommending the use of face masks to protect against respiratory illness. It recommends masks for healthcare workers, and people who are sick, to keep from spreading germs. Top health officials says the best way to avoid getting sick is washing your hands regularly throughout the day.

https://www.wral.com/as-coronavirus-concerns-spread-triangle-residents-finding-it-harder-to-find-face-masks/18925425/