About the Authors

Sheila M. Keating

Roles Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing

Affiliations Vitalant Research Institute, San Francisco, CA, United States of America, Department of Laboratory Medicine, University of California, San Francisco, CA, United States of America

Wes Rountree

Roles Data curation, Formal analysis, Methodology, Validation, Visualization, Writing – review & editing

Affiliation Duke Human Vaccine Institute, Duke University, Durham, NC, United States of America

Eduard Grebe

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

Affiliations Vitalant Research Institute, San Francisco, CA, United States of America, Department of Laboratory Medicine, University of California, San Francisco, CA, United States of America

Andrea L. Pappas

Roles Data curation, Funding acquisition, Project administration, Supervision, Visualization, Writing – original draft, Writing – review & editing

Affiliation Duke Human Vaccine Institute, Duke University, Durham, NC, United States of America

Mars Stone

Roles Project administration, Resources, Supervision, Writing – review & editing

Affiliations Vitalant Research Institute, San Francisco, CA, United States of America, Department of Laboratory Medicine, University of California, San Francisco, CA, United States of America

Dylan Hampton

Roles Data curation, Investigation, Project administration, Writing – review & editing

Affiliation Vitalant Research Institute, San Francisco, CA, United States of America

Christopher A. Todd

Roles Funding acquisition, Supervision, Writing – review & editing

Affiliation Duke Human Vaccine Institute, Duke University, Durham, NC, United States of America

Marek S. Poniewierski

Roles Data curation, Formal analysis, Methodology, Validation, Visualization, Writing – review & editing

Affiliation Duke Human Vaccine Institute, Duke University, Durham, NC, United States of America

Ana Sanchez

Roles Funding acquisition, Supervision

Affiliation Duke Human Vaccine Institute, Duke University, Durham, NC, United States of America

Cassandra G. Porth

Roles Data curation, Visualization, Writing – review & editing

Affiliation Duke Human Vaccine Institute, Duke University, Durham, NC, United States of America

Thomas N. Denny

Roles Funding acquisition, Supervision, Writing – review & editing

Affiliation Duke Human Vaccine Institute, Duke University, Durham, NC, United States of America

Michael P. Busch

Roles Conceptualization, Funding acquisition, Supervision, Writing – review & editing

MBusch@vitalant.org

Affiliations Vitalant Research Institute, San Francisco, CA, United States of America, Department of Laboratory Medicine, University of California, San Francisco, CA, United States of America

for the EQAPOL Limiting Antigen (LAg) Incidence Assay External Quality Assurance (EQA) Program

Program Advisory Committee members are listed in the Acknowledgments and participating sites in S1 Table.

Competing Interests

The authors have declared that no competing interests exist.