"Last week, the number of Covid-19 cases in children in the US reached levels not seen since the winter surge. And with the return to schools, the Delta variant on the rise and this winter approaching, health officials are concerned it could get worse."

"After a decline in early summer, child cases have increased exponentially -- with more than a four-fold increase in the past month, according to the latest report from the American Academy of Pediatrics and the Children's Hospital Association."