IL2 and measles: While the acute phase of measles is dominated by an immunostimulatory T helper 1 (Th1) response, characterized by IFNγ and interleukin 2 (IL-2) secretion, during the convalescent phase, cell-mediated immunity is progressively shifted towards a Th2 profile, with the expression of IL-4, IL-5, IL-10 and IL-13 [19].