Face masks effectively limit the probability of SARS-CoV-2 transmission

• https://science.sciencemag.org/content/early/2021/05/19/science.abg6296

Mask wearing for airborne diseases

There exist two regimes—virus-limited and virus-rich—and the effectiveness of the mask can vary depending on the regime.

In a virus-rich regime (e.g., hospital), a mask alone may not be enough to protect a person. In a virus-limited regime, masks are effective.