IL18 and lepromatous leprosy: Asthma is a Th2 cell‐mediated type 2 inflammation, lepromatous leprosy also characterized by the enrichment of Th2 cells and cytokines,58, 59 wherein IL‐18 activates Th2 cells to produce IL‐4 and IL‐13 in the absence of IL‐12 or IL‐15.60