The infiltration levels of memory B cells (p < 0.05) activated NK cells (p < 0.05), CD8+ T cells (p < 0.05) and resting NK cells (p < 0.05) were positively associated with BMI and Neutrophils (p < 0.05) infiltration level inversely correlated with BMI (Fig. 3c), which was contrary to the infiltration levels of immune cells in IBS patients. Here, CD8A is linked to irritable bowel syndrome.