The figure accounted for roughly four percent of the total US caseload over this period.
Children aged 12-17 were approximately twice as likely to be infected as those aged 5-11.
The report provides more data for trends that were already known, such as that Hispanic and black minority groups are at heightened risk of developing severe Covid-19, as are children with underlying conditions.
Almost 280,000 school-aged children were infected with the novel coronavirus between March 1 and September 19, according to detailed data released Monday in a report by the US Centers for Disease Control and Prevention (CDC).
The figure accounted for roughly four percent of the total US caseload over this period, with children aged 12-17 approximately twice as likely to be infected as those aged 5-11.
