In March, several Boston hospitals announced their participation in a national research study called Researching COVID to Enhance Recovery, or RECOVER study. An initiative from NIH, RECOVER seeks to understand the prevalence, risk factors, biological mechanisms, and possible causes of what doctors refer to as PASC, or Post-Acute Sequelae of SARS-CoV2, colloquially known as Long COVID. The six Boston hospitals involved in the study include Brigham and Women’s Hospital, Massachusetts General Hospital, Beth Israel Deaconess Medical Center, Tufts Medical Center, Boston Medical Center and Cambridge Health Alliance. The study will track adults who have a new COVID infection and their recovery, as well as adults who already have been diagnosed with Long COVID and look backward at the trajectory of their illness. All will be followed for three years. Nationally, there are 15 research groups, including Boston’s, that will be participating in study. The research groups plan to recruit 17,680 participants nationwide.