Fig. 4From: Development and validation of an indirect ELISA as a confirmatory test for surveillance of infectious bovine rhinotracheitis in vaccinated herdsResults of the rec-gE ELISA. a Distribution of the reactivity of the tested sera; the horizontal dashed line indicates the cut-off for the rec-gE ELISA. b ROC curve showing the best sensitivity/specificity compromise (black dot). A magnification of the high-performance region is boxed within the graphBack to article page