An observational study has launched to evaluate the short- and long-term health outcomes of SARS-CoV-2 infection in children, including multisystem inflammatory syndrome in children (MIS-C), and to characterize the immunologic pathways associated with different disease presentations and outcomes. SARS-CoV-2 is the virus that causes COVID-19. The study, called the Pediatric Research Immune Network on SARS-CoV-2