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IgG titers against days of sample collection from symptom onset and correlation between IgG (N) and IgG (RBD) titers. Blue circle: presumed COVID-19 negative. Orange square: presumed COVID-19 positive. A) IgG (N). B) IgG (RBD). C) Correlation between IgG (N) and IgG (RBD) titers. Dotted lines indicate the cut-offs derived from the ROC analyses; 0.2 S/C and 7.2 AU/mL for IgG (N) and IgG (RBD), respectively. ROC; receiver operating characteristic.
