Masks and portable air cleaners reduced the spread of COVID-19 in schools, study shows
"Masks and portable air cleaners reduced the spread of COVID-19 in schools, study shows"
Pediatric COVID-19 Cases in Counties With and Without School Mask Requirements — United States, July 1–September 4, 2021
Alberta Health data & analysis (from Feb 7) shows that schools w/ mask mandates had 3x less outbreaks & adults in those communities had 3x less hospitalizations. Indirectly it shows that school infections do drive community spread.