IL17A and abortion: Accordingly, a prevalence of Th17/Th2 cells (producing IL-17 and IL-4) has been found in the deciduae of successful pregnancies, whereas Th17 (producing IL-17 only) and Th17/Th1 (producing IL-17 and IFN-γ) cells have been exclusively observed during a spontaneous abortion in the decidua of a women suffering from unexplained recurrent abortion (URA) [11,12].