7 ms·

Surgical masks probably help on a population level. https://med.stanford.edu/news/all-news/2021/09/surgical-masks-covid-19.html https://med.stanford.edu/news/a

• jjgreen 5y ago
  This is still in peer-review
  • roywiggins 5y ago
    It's since been published in Science. https://www.science.org/doi/10.1126/science.abi9069 https://www.science.org/doi/10.1126/science.abi9069