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Performance of sgG-2 and mgG-2 ELISAs presented as ROC plots for blood donors (A) and the GUD cohort (B). Cutoff values of control serum (CS) plus 0.1 to 0.6 OD units by incremental steps of 0.02 are plotted for both cohorts. For mgG-2 ELISA in the GUD cohort, plots representing CS plus 0.7, 0.8, 0.9, and 1.0 OD unit are plotted as well. The plots corresponding to CS plus 0.35 OD unit used as cutoff values are indicated with asterisks.
