IFNG and infection: We and others have demonstrated that infection of monocytes/macrophages with Ba provokes an alteration of various functions of those cells: 1) reduced IFN-γ-induced expression of MHC-I and MHC-II and consequent impaired antigen presentation capacity [6–9]; 2) diminished phagocytosis [25]; 3) interfered TLRs signalling [26,27] and 4) inhibited apoptosis [28,29].