OBJECTIVE To investigate therapeutic effects and mechanism of quercetin and 5-aminosalicylic acid(5-ASA)on post-infectious irritable bowel syndrome(PI-IBS)in rats.METHODS PI-IBS rats were orally administered 5-ASA,quercetin or 5-ASA plus quercetin,respectively.Drugs were given to rats for 2 weeks consecutively.After treatment,visceral pain threshold pressure was measured by abdominal withdrawal reflex test,while colonic transit was evaluated by water avoidance stress test in PI-IBS rats.Then blood samples a...