The ratio of Th1 and Th2 cells is important for normal immune response [5]; meanwhile, in an adaptive immune response IFN-γ is a subset of CD4+ T helper 1 cells (Th1) that plays an important role in severe inflammation [6] by promoting inflammatory response. S. aureus infection can induce the release of a variety of inflammatory factors, such as IFN-γ [7]. S. aureus can also cause intestinal infection. This evidence concerns the gene IFNG and digestive system infectious disorder.