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Correlations between SARS-CoV-2 enzyme immunoassay ratio results and neutralizing antibody titer AUC values in COVID-19 convalescent individuals (n = 140). Spearman correlation coefficients (ρ) were calculated with 95% confidence intervals (CI) estimated over 1,000 bootstrap iterations. The straight vertical black line indicates the cutoff for SARS-CoV-2 seropositivity.
