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ever high schools have higher rates. We collected published records of COVID-19 school outbreaks globally to investigate the considerable heterogeneity in secondary attack rates (SAR) reported from school outbreaks and compiled information regarding potential risk factors.Higher community death and case rates are associated with higher SARs in children in school settings.Mask-wearing and social distancing are associated with lower SARs.When compared to pre-schools and early childhood education centers, primary schools have lower rates