In the spring, doctors began noticing a mysterious inflammatory condition in children that involved fever, rashes, diarrhea and vomiting. Now known as Multisystem Inflammatory Syndrome in Children, or MIS-C, the rare syndrome seems to be a postviral inflammatory response to COVID-19. Dr. Edward Behrens, Chief of the Division of Rheumatology and Director of the Immune Dysregulation Frontier Program, discusses what his team has discovered about MIS-C and what gives him hope for the future.