MPO and infectious otitis media: Myeloperoxidase activity which was used to quantify neutrophil accumulation in colonic tissues was significantly (P < 0.05) higher in the DSS group (14.1 U/g (8.8–20.9)) than in the NC group (5.6 U/g (3.0–5.8)) and in the AOM group (5.5 U/g (4.9–8.7)) (Figure 1).