
COMMENTARY: Masks-for-all for COVID-19 not based on sound data | CIDRAP
The evidence does not conclusively favor using masks, whether homemade or surgical, to protect against the disease.
https://web.archive.org/web/20200717141836/https://www.cidrap.umn.edu/news-perspective/2020/04/commentary-masks-all-covid-19-not-based-sound-data