الفهرس 
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Abstract
bililharziasis was highly endemic In ancient EGYPT (1250 B.C). But become a serious problem in nineteenth century after perennial I rrgat ion was insti tuod.
Ft was discoverd by THEODOR B1LIIAR’/. in Cairo in 1861. It is one of the most important causes of morbidity in
EGYPT.
Penetratiom of the skin by the cercariae may produce a papular eruption. During the migration of immature schistosomes transitory lesions may be produced.
In a heavy schistosomal infection ova may be found widely distributed in many systems of the body as heart, and lung. After the egg has escaped from the vein a granuloma forms around it and fibrous tissue forms at the site. The degree of fibrosis depends on the intensity of the infection and the length of the time patient has been exposed to re-infection.
As the ova causes necrot I zing artcr I C) I I t is in the sma I I pu I mona ry a r ter 01 CS. The ova escape t. hrough the necrotic wall and causes microscopic bilharziomata.