Fig. 2

Receiver operating characteristic (ROC) analysis for competitive ELISA. The assay was conducted with PDCoV-positive sera (n = 39) and PDCoV-negative sera (n = 83). A ROC analysis of the competitive ELISA results; the area under the curve (AUC) of the test was 0.9919. B Interactive dot plot diagram displaying the PI value of each serum sample when the cutoff value was set to 26.8%. PDCoV (porcine deltacoronavirus), ROC (receiver operating characteristic), AUC (area under the curve)