> N95s or basic cloth masks are a relatively straightforward way to get a population on the other side of that threshold, even if some people wear them incorrec

> N95s or basic cloth masks are a relatively straightforward way to get a population on the other side of that threshold, even if some people wear them incorrectly were just unlucky. Controlled tests (with correct fitting) show cloth masks at around 10% efficiency and surgical masks at around 12% efficiency, vs up to 60% for correctly fitted R95/KN95 masks. The difference is huge. The measures that most people are taking with their loosely-fitting cloth masks are having negligible impact on coronavirus transmission. [0] https://aip.scitation.org/doi/10.1063/5.0057100 https://aip.scitation.org/doi/10.1063/5.0057100