U.S. school mask mandates reduced transmission of the coronavirus delta variant by 72 percent.
During the COVID-19 pandemic’s delta variant wave, schools that required masking had approximately
of in-school coronavirus transmission than schools with optional or partial masking policies, researchers report online March 9 inWhile the findings reinforce past research on masking efficacy, this is the first study to focus on secondary transmissions, or transmissions that happen at school, says study coauthor Danny Benjamin, an epidemiologist at Duke University.
Now that vaccines are available for kids ages 5 to 11, the researchers are collecting more data from schools. Masking has continued to work during the omicron variant surge, but even short intervals of mask removal, such as at lunchtime, result in much higher transmission than during the delta wave, Benjamin says.
As state mask mandates lift, the onus for mask requirements in schools falls to the school districts. To help school administrators decide if and when students need to mask, Benjamin and colleagues developed the. The tool allows administrators to input their community COVID-19 rates and determine how masking decisions in schools will affect case numbers.
“This is a very granular and local and nuanced decision,” Benjamin says. Right now, as the omicron surge recedes in some parts of the country, “it’s a reasonable discussion to be having.”
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