COVID-19 Proficiency Sample Panel 1 includes a set of sixteen (16) human serum samples intended for use as test samples in MSD’s V-PLEX COVID-19 Serology Kits. MSD provides assigned values for the concentration of antibodies to antigens from SARS-CoV-2, SARS-1, MERS, circulating Coronaviruses, and other respiratory disease viruses in each sample, enabling users to assess their laboratory performance for testing, training, concordance studies, validations, and troubleshooting.