The diarrhoea is a flagellate parasite,intestinalis. It is present in small intestine. The cell body is pear-shaped with dorsal side convex and ventral side flattened and deepened anteriorly to form a suction groove. The nuclei and four pairs of flagella arranged symmetrically. The parasite divide by binary fission to multiply rapidly and feeds upon aminoacids and vitamins .It causes intestinal disorders leading to epigastric pain, abdominal discomfort,loss of appetite and headache. The transmission of parasite takes place through cysts which are voided with the faces and enters the new hosts . The infection of Girdia is more in children than in adults .
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