Fig. 3

Discrimination function (DF) plot for GA-QDA in liquid phase (A) and SPA-QDA in dried phase (B) models (the blue circles indicate dengue, and the red circles indicate leptospirosis); (C) selected variables for both models (GA-QDA in liquid phase – blue; SPA-QDA in dried phase – red); (D) ROC curves for both GA-QDA in liquid phase and SPA-QDA in dried phase models.