IFNG and infection: In resistant mice, (C57BL/6) immuneresponse is oriented to Th1, associated with the production of interferon-gamma (IFN-γ) andinterleukin-12 (IL-12) at the site of infection, which inhibite parasite development.Susceptible mice (BALB/c) extend Th2 immune response associated with IL-4 production thatterminated to systemic dissemination of the parasite (4).