Other reports rolled in—a death in France, a cluster in Italy—and in the US, the CDC put together what had been observed of the unusual condition and asked physicians to report cases that matched to state health departments. Coming up with a case definition is a first step in conducting surveillance for what might be a new disease. With it, the CDC learned by mid-May of more than 100 US kids with the condition, three of whom had died.
On August 7, the agency updated those numbers. As of the end of July, 570 US kids had experienced that constellation of shock, heart problems, and gastrointestinal problems; had blood work that indicated inflammation was going on in their bodies; and were positive for Covid-19. Many of them were seriously ill: 364 needed to be treated in an ICU, and 10 died. In many of them, several organs—heart, lungs, kidneys and