A Th1 cytokine profile, with elevations in peripheral blood gamma interferon (IFN-γ) and interleukin-2 (IL-2), is present during the measles prodrome [62], whereas measles convalescence is characterized by elevations in Th2 cytokines, such as interleukin-4 (IL-4) and interleukin-5 (IL-5). This evidence concerns the gene IL4 and measles.