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Rank correlations between titers of viral neutralization tests (NT) and RBD antibody concentrations quantified by the Technozym RBD ELISA (a) or S1/S2 antibodies (b). The figures in the second and third columns present rank correlations between NT and RBD with anti-nucleocapsid antibody concentrations kept constant in two different assays (Abbott, Roche). R2, coefficient of determination.
