We will aim to enroll children who have had a nasal swab test showing infection with SARS-CoV-2, the virus that causes COVID-19, or children with a serious complication of COVID-19 called the Multi-system Inflammatory Syndrome in Children (MIS-C). This study does not offer any treatment for COVID-19 or MIS-C. The purpose of the study is to collect information that will help us understand what happens to children and young adults who get infected with SARS-CoV-2, and how their immune system responds. Most of the information that we will collect is part of usual care for young people who have COVID-19 or MIS-C. In addition, we will do some extra clinical and blood tests. Children and young adults who are enrolled in the study will be followed for one year. Our goal is to enroll up to 250 children and young adults (up to the time of your 21st birthday) from about 20 hospitals in the United States. At our center we plan to enroll about 30 participants.

The purpose of this study is to create and maintain a registry, which is a database (a searchable collection of information) about children, adolescents and young adults with pediatric onset of rheumatic diseases. This data may help in the evaluation of the safety and benefit of medications that are prescribed to patients who have rheumatic diseases.