ROC curves. ROC curves are shown for the polyspecific ELISA, IgG-specific ELISA, KKO-I, and DT40-luc. The AUCs for these assays were 0.82, 0.76, 0.93, and 0.89, respectively. The AUC for KKO-I was significantly greater than the AUC for the polyspecific (P = .020) and IgG-specific ELISAs (P = .0044). The AUC for DT40-luc was significantly greater than the AUC for the IgG-specific (P = .046) but not the polyspecific ELISA (P = .28).