U.S. pediatricians say Covid cases in children are on the rise.

These cases accounted for about a quarter of the country’s caseload for the week, the statement said. Children under 18 make up about 22 percent of the U.S. population. “Is there cause for concern? Absolutely,” Dr. Sean O’Leary, the vice chair of the academy’s infectious diseases committee, said in an interview on Monday night. “What’s driving the increase in kids is there is an increase in cases overall.”