الفهرس 
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Abstract
Giardia and Lamblia are two genus names, which are presently used to describe these amsms (giardiasis and lambliasis respectively are the terms used to denote the symptomatic an infection). Body measurements of the trophozoites and/or size of the cyst have been to differentiate between species of Giardia. One of the major criterion used to erentiate between species of Giardia is the host specificity. Some authors believed that rdia is strictly host specific. On the other hand, the results of numerous cross-transmission dies indicate that, at least in some cases, Giardia can be transmitted between animal species. Ingestion of Giardia cysts was followed by their passage through the stomach and into small intestine where excystation took place. There no doubt that the parasite is a common se of diarrhoeal illness both in the tropics and in temperate zones. It can give rise to an te, self-limiting diarrhoea with or without abdominal discomfort and vague upper rointestinal symptoms, to a chronic, intermittent diarrhoea with distention and flatulence, to a malabsorption syndrome. Some workers reported the functional effects of the small wel changes as a malabsorption of fat, Vitamin A, D-xylose and probably folic acid with rmal absorption of iron and vitamin Bl2. Morphometric study of the cysts excreted in the stool of 130 patients (asymptomatic & ptomatic cyst passers), using trichrome (permanent) stain and the length and the width of cysts are measured using the micrometer under the oil immersion lens. There was a ificant difference in both length and width of the cysts in both groups of patients, P< 0.05 ith the mean of length 8.1 +0.33 to 10.36+0.12 pm and the mean of width 5.2+0.25 .