The notable inflammatory response that accompanies induced colitis was confirmed by a significant increase in myeloperoxidase (MPO) activity (7- and 2-fold higher than PBS-L. lactis-WT and DSS-L. lactis-WT mice, respectively, p < 0.001 and p < 0.05), a marker for tissue neutrophil content (Figure 4e). Here, MPO is linked to colitis.