The proportion of US pediatric COVID-19 cases has risen substantially over time, with significant geographic variation, according to a study today in Pediatrics and a joint report from the American Academy of Pediatrics (AAP) and the Children's Hospital Association (CHA) also published today.But although children represent a growing percentage of total cases, severe disease remains uncommon, the data show.From 2% to 10.5% of cumulative casesThe studies examined trends in child COVID-19 cases using state health department website data for 49 states, 2 large, urban areas—New York City (NYC) and Washington, D.C.—and the territories of Puerto Rico and Guam.