Bacterial or viral infection of the intestine may result in explosive watery diarrhea , tenesmus ( spasmodic contraction of anal sphincter with pain and persistent desire to defecate ) , and abdominal cramping pain 肠道被细菌或病毒感染，引起暴发性水泻、里急后重（肛门括约肌痉挛性收缩伴疼痛，一直想要排便）及腹部绞痛。
