FAS and clostridium difficile infection: In the CDI group, the expression of IL15RA, IL-15, IL-7, IL4R, IL-18, FAS, TNFSF13B, TNFSRF1A, CXCL10 among others were found to be higher in patients in a high-risk group whereas, the expression of LIFR, IL6R, EPOR, KITLG, ACVR2B and IL11RA was found to be higher in the low-risk group (Figure 4d).