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结肠小袋纤毛虫为人体最大的寄生原虫,主要侵犯人或动物的结肠,病理组织改变与阿米巴痢疾相似,但肠粘膜溃疡的程度较轻。临床症状亦与急、慢性痢疾或肠炎相似,严重者亦可引起肠穿孔甚至死亡。诊断主要依据在患者粪便中检出大量活动之滋养体(滋养体长50～80微米,宽30～60微米,用身披短小纤毛,不断颤动,在环境不利时可形成包囊)。此外有报告在肝脓肿内或肺及心脏内曾发现本虫(Cecil-Loeb:Textbook of Medicine,13th ed,p 735,1971)。
Colon pouch ciliates the largest parasitic protozoan of the human body, mainly invades the colon of humans or animals, and the histopathological changes are similar to those of amoebic dysentery, but to a lesser extent intestinal ulcer. Clinical symptoms are also similar to acute, chronic dysentery or enteritis, severe cases can also cause intestinal perforation and even death. The diagnosis is mainly based on the detection of a large number of nocturnal trophozoites (trophozoites 50 to 80 microns in width and 30 to 60 microns in width) in the stool of the patient, wearing short clumps, vibrating constantly and forming cysts in adverse conditions. It has also been reported that this insect was found in liver abscess or in the lung and heart (Cecil-Loeb: Textbook of Medicine, 13th ed, p 735, 1971).