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This study created a model comparing states with mandated public face mask use versus states without a mandate. It found that SARS-CoV-2 infection transmission was decreased by the mandates. Comment: There is some controversy regarding face mask use, but this study suggests a net benefit in terms of disease transmission to governmental mandates requiring use. Note, however, that it did not look at clinical outcomes but only at rate of growth of reported cases. This is highly fragile data, as growth in reported cases is affected by how many people get tested. How many people get tested may be strongly dependent upon a governmental requirement for face mask use. Health Aff (Millwood) . 2020 Jun 16;101377hlthaff202000818.    (retrieved Jun, 2020). There are currently 1090 pearls in the database. While every attempt has been made to ensure accuracy, mistakes can and do occur. Use databank at your own risk. All pearls © 2024 by the Internet Medical Association. Click Here to view more medical pearls.