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Analytical specificity (a) and sensitivity (b) of the multiplex SARS‐CoV‐2 ECL serology assay to measure antibodies to heterologous and homologous antigens. ECL, electrochemiluminescence; H3, H3 Hong Kong influenza hemagglutinin; N, nucleocapsid protein; OC43, seasonal coronavirus OC43 spike protein; RBD, receptor‐binding domain; S, spike protein; SARS‐CoV‐2, severe acute respiratory syndrome coronavirus 2.
