Methods
Subjects were referred to Pulmonary Clinic at the Children’s Hospital of Philadelphia (CHOP) for evaluation of persistent respiratory symptoms six weeks or more after acute COVID-19 infection between December 2020 and April 2021. Inclusion criteria included a history of SARS-CoV-2 RNA positivity or confirmed close household contact. Demographic, clinical, imaging, and functional test data were collected through retrospective chart review. Pulmonary function and six-minute walk test (6MWT) variables were referenced to predicted normal values13-15. The study was approved by the Children’s Hospital of Philadelphia Institutional Review Board for exempt research.