https://ift.tt/VR9MWar

https://www.nih.gov/news-events/news-releases/mandatory-masking-schools-reduced-covid-19-cases-during-delta-surge:

In other words, school districts with optional masking had approximately 3.6 times the rate of in-school COVID-19 cases when compared to schools with mandatory masking. nih.gov/news-events/news-releases/mandatory-masking-schools-reduced-covid-19-cases-during-delta-surge

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