Health officials in the U.K. are warning that Covid-19 could be causing a new and rare inflammatory condition in children. Britain’s Paediatric Intensive Care Society said Monday the National Health Service alerted it to a small number of critically ill children resenting with “an unusual clinical picture.” The society noted that many — but not all — of the children with symptoms of the new inflammatory disease had been diagnosed with Covid-19. The condition was likened to toxic shock syndrome and Kawasaki disease.