Only two AMP genes (PYY and CHGB) both belonging to the neuropeptide group showed a more than 2-fold significantly decreased expression in active CDi at baseline when compared to control ileums, and PYY expression remained more than 2-fold significantly lower in CDi responders after infliximab treatment compared to control ileums (Table 3). This evidence concerns the gene NPS and clostridium difficile infection.