IL17A and irritable bowel syndrome: In comparison with control, IL-17 expression was increased in PI-IBS as well as Streptococcus group (p<0.05).The groups of Bifidobacterium, Lactobacillus and Mixture, but not Streptococcus group cut down the expression of IL-17 (0.75±0.07,0.66±0.06, 0.47±0.10vs1.19±0.13).