Definition: the vesical blood fluke, a species with terminally spined eggs that occurs as a parasite in the portal system and mesenteric veins of the bladder (causing human schistosomiasis haematobium) and rectum; common in the Nile delta but is found along waterways, irrigation ditches, or streams throughout Africa and in parts of the Middle East; the intermediate host is Bulinus truncatus in Egypt; elsewhere, other snails of the subfamily Bulininae (Bulinus, Physopsis, Pyrgophysa) are involved.
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