About the Authors

Sachie Ikegami

Roles Conceptualization, Writing – original draft, Writing – review & editing

Affiliation Department of Pathology and Laboratory Medicine, NorthShore University HealthSystem, Evanston, Illinois, United States of America

Robert C. Benirschke

Roles Conceptualization, Data curation, Formal analysis, Visualization, Writing – original draft, Writing – review & editing

Affiliation Department of Pathology and Laboratory Medicine, NorthShore University HealthSystem, Evanston, Illinois, United States of America

Hossein Fakhrai-Rad

Roles Conceptualization, Visualization, Writing – original draft, Writing – review & editing

Affiliation Genalyte Inc., San Diego, California, United States of America

Mohammad H. Motamedi

Roles Conceptualization, Formal analysis, Visualization, Writing – original draft, Writing – review & editing

Affiliation Genalyte Inc., San Diego, California, United States of America

Rick Hockett

Roles Conceptualization, Writing – review & editing

Affiliation Genalyte Inc., San Diego, California, United States of America

Sean David

Roles Conceptualization, Writing – review & editing

Affiliations Department of Pathology and Laboratory Medicine, NorthShore University HealthSystem, Evanston, Illinois, United States of America, Department of Family Medicine, Pritzker School of Medicine, University of Chicago, Chicago, Illinois, United States of America

Hong Kee Lee

Roles Conceptualization, Writing – review & editing

Affiliation Department of Pathology and Laboratory Medicine, NorthShore University HealthSystem, Evanston, Illinois, United States of America

Jason Kang

Roles Conceptualization, Writing – review & editing

Affiliation Department of Pathology and Laboratory Medicine, NorthShore University HealthSystem, Evanston, Illinois, United States of America

Thomas J. Gniadek

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Visualization, Writing – original draft, Writing – review & editing

tgniadek@northshore.org

Affiliation Department of Pathology and Laboratory Medicine, NorthShore University HealthSystem, Evanston, Illinois, United States of America

Competing Interests

The authors have read the journal’s policy and have the following competing interests: Procurement and testing of samples collected prior to the year 2020 was paid for by Genalyte, Inc. NorthShore University HealthSystem paid for testing of convalescent plasma donor samples on the three in-house assays, however it was not charged for testing on Genalyte’s assay. Hossein Fakhrai-Rad, Rick Hockett, and Mohammad H. Motamedi are employees of Genalyte, the commercial manufacturer of Genalyte’s SARS-CoV-2 Multi-Antigen Serology Panel. Sean David owns equity in Genalyte. Thomas J. Gniadek, Hong Kee Lee, Jason Kang, Robert C. Benirschke, and Sean David are paid employees of NorthShore University HealthSystem. This does not alter our adherence to PLOS ONE policies on sharing data and materials.