There were lower rates of Covid infections in more than 500 counties where school districts observed mask mandates, according to a Centers for Disease Control study.
But beware of the CDC's mask-uber-alles mentality, write Steven Hayward on Powerline.
"In a peer-reviewed study published recently in the Journal of Infection, two researchers replicated the CDC findings, but then reviewed a wider data set of more than 1,800 counties, over a longer time horizon, and found a lower rate of COVID infections than the masked-up counties," he writes.
By the end of nine weeks, counties with mask mandates averaged 18.3 average daily pediatric case rates per 100,000, while those without mandates averaged 15.8 per 100,000, researchers found. The difference was "not statistically significant."