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Observations on Bilharziasis amongst the Egyptian Expeditionary Force

Published online by Cambridge University Press:  06 April 2009

Philip Manson-Bahr
Affiliation:
Brevet-Major, R.A.M.C., Lecturer London School of Tropical Medicine, and Assistant Physician, Albert Dock Hospital, E.
N. Hamilton Fairley
Affiliation:
Pathologist, Walter and Eliza Hall Institute of Research, Melbourne, late Pathologist 14th Australian General Hospital, and Lecturer on Parasitology Egyptian University.

Extract

In 1851, Bilharz (1852) first discovered paired adult trematode worms originally named after him in the portal system of an Egyptian fellah. Subsequently, investigations of the deposits of ova in excreta were made, but numerous attempts by Cobbold, Sonsino, Lortet and Vialleton (1894) and others, to unravel the life history of the parasite, failed. Looss (1896), appreciating that the digenetic trematodes must necessarily pass through a molluscan intermediary, dissected many species of snails collected from the fresh-water canals around Cairo. He failed to find the cercariae of bilharzia, and discarded the hypothesis of an intermediate molluscan host. As, however, the miracidium of Schistosomum haematobium contained germinal cells within its body cavity, it must, naturally, he argued, have been destined to produce sporocysts at some stage of its life cycle. In view of this, Looss evolved the hypothesis that man acted simultaneously as the intermediary, as well as the definitive host of this parasite.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1920

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