IFNG and infection: From studies on human patients who became victims of generalized BCG infections (BCGitis), some key host factors essential for efficient control of mycobacterial infections, such as IFN-γ and IL-12 receptors, have been identified [106]; however, it is not known if any of these factors play a role in the natural infection cycle of voles with M. microti, or mongoose or meerkats with 'M.