On Oct. 6, 2020, clinicians and researchers from Brigham and Women’s Hospital, the Broad Institute of MIT and Harvard, and the MGB Center for COVID Innovation announced the launch of TestBoston, a large-scale research study to detect active COVID-19 cases and evidence of previous infection, as well as changes in the rates of both, in a representative group of 10,000 Brigham patients reflecting the demographics of greater Boston.