Schools with universal masking were 3.5 times less likely to have a COVID-19 outbreak and saw rates of child COVID-19 cases 50 percent lower in their counties compared with schools without mask requirements. That’s according to two new studies published Friday by the Centers for Disease Control and Prevention.
The new data lands as masks continue to be a political and social flash point in the US. And children—many of whom are still ineligible for vaccination—have headed back into classrooms.
In one of the newly published studies, health researchers in Arizona looked at schools with and without mask policies in Maricopa and Pima Counties. Together, the counties account for more than 75 percent of the state’s population. The researchers identified 210 schools that had universal masking requirements from the start of their school years. They compared those to 480 schools that had no mask requirements throughout the study period, which ran from July 15 to August 30.
The researchers tallied 129 school-associated COVID-19 outbreaks in all of those schools during the study period. About 87.5 percent of the outbreaks were in schools without mask requirements. The researchers then ran an analysis, adjusting for school sizes, COVID-19 case rates in each school’s zip code, socioeconomics measures, and other factors. The researchers found that the odds of a school-associated COVID-19 outbreak were 3.5 times higher in the schools without mask requirements compared to those with universal masking.
In a separate study, CDC researchers tried to assess if schools’ mask policies have broader impacts for their communities—and they do. The researchers looked at county-level data on the rates of pediatric COVID-19 cases in 520 counties around the US. They compared rates of child COVID-19 cases in the week before and week after schools started their terms.
Though all counties generally saw increases in pediatric COVID-19 cases after schools started up, the counties with universally masked schools saw smaller bumps. For counties with school mask requirements, the average increase in case rates after schools started was 16.32 cases per 100,000 children per day. Counties without school mask requirements saw an average rate increase about twice as high—34.85 cases per 100,000 children per day.
The US continues to see a patchwork of mask use and other protective measures in schools as the 2021-2022 school year gets underway. Many schools in many states do not have universal masking requirements even though the CDC and the American Academy of Pediatrics both recommend universal masking in schools. In some states state leaders have prohibited schools from issuing mask requirements—and even penalized them for requiring masks.
Florida Governor Ron DeSantis is among the leaders who have banned mask mandates in schools. And, although the ban is being challenged in court, DeSantis is withholding money from school boards that have issued mask mandates anyway.
On Thursday, the US Department of Education announced that it had granted the school board of Florida’s Alachua County $147,719. The money is intended to “restore funding withheld by state leaders—such as salaries for school board members or superintendents who have had their pay cut—when a school district implemented strategies to help prevent the spread of COVID-19 in schools.”
In a statement, Alachua County Public School Superintendent Dr. Carlee Simon: “I’m very grateful to [US Secretary of Education Miguel] Cardona, President Biden and the federal government for the funding. But I’m even more grateful for their continued support and encouragement of our efforts to protect students and staff and to keep our schools open for in-person learning.”
Alachua is the first county in the nation to receive such funding, provided through the new Project to Support America’s Families and Educators (Project SAFE) grant program.
In a separate statement, education secretary Cardona said: “We should be thanking districts for using proven strategies that will keep schools open and safe, not punishing them. We stand with the dedicated educators in Alachua and across the country doing the right thing to protect their school communities.”
Public health experts say that masks are a critical tool to help protect children, teachers, and staff from the spread of the pandemic coronavirus, SARS-CoV-2. Masks are intended to be one key layer of a multi-layered approach that also includes vaccination for those eligible, physical distancing when possible, improved ventilation, testing, quarantining, improved hygiene, and disinfection and cleaning.