Researchers conducted the study when the delta variant was the dominant strain and found that mask requirements resulted in 72-percent fewer cases.
The study included 61 school districts from kindergarten through grade 12 that provided data from July 26, 2021, through Dec. 13, 2021.
According to the study’s authors, six districts had optional masking policies, nine had partial masking policies and 46 had universal masking. The researchers found that for every 100 community-acquired cases, school districts with mandatory masking had approximately 7.3 cases of in-school infections, while optionally masked districts had 26.4 cases of in-school infections. 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.
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