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Figure 1 | BMC Infectious Diseases

Figure 1

From: Serological survey of Leishmaniainfection in blood donors in Salvador, Northeastern Brazil

Figure 1

ROC curve of antibody levels predict the positivity thresholds against SLA. (A) ROC curves were constructed using data obtained in ELISA performed with SLA from L. infantum (L. i) or from L. amazonensis (L.a) and sera from confirmed VL patients (n = 20) and from control subjects from a non-endemic (n = 20) area. The red line represents the area under the curve for L.ic and the blue line represents the area under the curve for L.a. (B) Detailed information obtained for each ROC curve (cut-off values chosen, area under the curve, the values of p, and the sensitivity and specificity with a confidence interval of 95% and the likelihood ratio) is shown on the right.

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