This is a quote from the article "Moderna seeks vaccine approval" in today's Eagle, about COVID shots for kids under 5. "Already about three-quarters of children of all ages show signs they've been infected at some point during the pandemic." No source/reference is given, of course, but is Lauran Neergaard of AP saying 75% of all U.S. children have had COVID? Am I misunderstanding this quote, or if not, can anyone explain the source of this information?