Since the Centers for Disease Control and Prevention began recommending that members of the public mask up last spring, additional research has backed the use of face masks to combat the coronavirus, but knowledge gaps still remain. Here, we summarize the evidence.
Headlines shared on social media distort the facts of a recent order by the Centers for Disease Control and Prevention that mandates face masks be worn on public transportation. The order doesn’t require that individuals wear two masks. CDC guidance issued with the order does say that cloth masks should be made of at least two layers.