In part the National Academies describe long COVID as "a chronic, systemic disease state with profound consequences." The report provides a working definition.
“Inconsistent disease terminology and meaning can confound clinicians, limit the generalizability of research findings, and inhibit patients from obtaining the recognition, care, and support they need,” Harvey V Fineberg, chair of NASEM’s Committee on Examining the Working Definition for Long COVID, said in the report’s preface.
NASEM convened a committee of technical experts across disciplines and "members whose lived experience as patients could inform the process of developing a definition." The slide show above provides highlights of the full consensus report as summarized by NASEM, including the agreed-upon definition, the single or multiple symptoms, and single or multiple diagnosable conditions. NASEM provides 7 important features of long COVID that reflect its unpredictable course and that all who have, have had, or who treat or study the disorder should bear in mind.