IFNG and leprosy: In order to link responses of the Brazilian groups of individuals with increasing exposure to M. leprae and increasing bacillary loads among the patients, the medians for the IFN-γ levels in response to the M. leprae-specific peptides were plotted simultaneously, and the resulting graphic shows an initial increase in the IFN-γ levels to all the peptides starting at baseline with the Brazilian non-endemic group (NECBrazil) and the endemic controls in area of medium leprosy detection rate (EClow).