Further, the earlier detection of ex vivo IFN-γ responses to M. bovis TL at week-2 in comparison to Mtb TL responses at week-3 post-BCG inoculation suggest that there may be strain-specific differences in the lipids presented (71) and that broader cross-reactive responses likely develop later during mycobacterial infection. The gene discussed is IFNG; the disease is Mycobacterium infection.