IFNG and chlamydia infectious disease: Strong interferon (IFN)γ and adaptive Th1 responses promote the clearance of Chlamydia and limit the development of disease (Cohen et al, 2005; Cotter et al, 1997; Debattista et al, 2002; Johansson et al, 1997; Kaiko et al, 2008; Perry et al, 1997; Wang et al, 1999) and the production of IFNγ during the early stages also plays an important role in controlling Chlamydia infections.