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Correlation of neutralizing SARS-CoV-2 antibody ratio and SARS-CoV-2 IgG antibodies against S protein, as measured with a chemiluminescence enzyme immunoassay (CLIA). BAU, binding antibody unit; IgG, immunoglobulin G. p < 0.0001, R = 0.6, regression line (black line) with 95% confidence interval (dashed lines).
