| Completed | N/A | 244 | US | SARS-CoV-2 and/or MIS-C Exposure, Exposure: Severe Acute Respiratory Syndrome Coronavirus 2 Infection and/or Multisystem Inflammatory Syndrome in Children diagnosis | National Institute of Allergy and Infectious Diseases (NIAID), Autoimmunity Centers of Excellence, Clinical Trials in Organ Transplantation in Children | Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), Multisystem Inflammatory Syndrome in Children (MIS-C), Coronavirus Disease 2019 (COVID-19) | 03/23 | 03/23 | | |