Studies show more COVID-19 cases in areas without school masking policies

Sept. 28, 2021

The Centers for Disease Control Prevention (CDC) released three studies in the Morbidity and Mortality Weekly Report (MMWR) that highlight the importance of using layered prevention strategies including universal masking to stop the spread and minimize disruptions to school operations for safe in-person education.

These studies found that school districts without a universal masking policy in place were more likely to have COVID-19 outbreaks. Nationwide, counties without masking requirements saw the number of pediatric COVID-19 cases increase nearly twice as quickly during this same period. 

One report from Arizona revealed that schools in two of the state’s most populous counties were 3.5 times more likely to have COVID-19 outbreaks if they did not have a mask requirement at the start of school compared with schools that required universal masking on day one. Universal masking is an important component in the recommended layered prevention strategy for schools, and this study continues to demonstrate that facemasks when used as part of the larger strategy can reduce spread of COVID-19 and prevent outbreaks in schools. 

Another report found that during the two weeks following the start of school, the average change in pediatric COVID-19 case rates was lower among counties with school mask requirements (16.32 per 100,000/day) compared with counties without school mask requirements (34.85 cases per 100,000/day).

This highlights the impact that universal masking policies can have on the communities that surround these school districts, as the impact of the policies can reduce the burden on the health care systems that support these school districts. 

CDC release

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