IFNG and leprosy: While Tuberculoid (TT) or Paucibacillary (PB) leprosy patients show a Th1 immune profile with higher levels of interleukin-2 (IL-2) and interferon-γ (IFN-γ), lepromatous (LL) or multibacillary (MB) patients exhibit a Th2 immune profile with the rise in IL-10 and IL-4 interleukins (7).