By John M. Watson and J. B. Stenlake (Auth.)
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Extra info for An Introduction to Parasitology
Congestion and enlargement of the spleen follow. Pulmonary lesions and fever may also occur, both during the incubation period and later. Lesions and symptoms are more serious in S. japonicum infection than in Mansonian schistosomiasis, and the disease runs a more rapid course. Toxaemia, in particular, is more marked. Schistosomiasis is one of the major tropical diseases of the world, affecting tens of millions of persons and ranking second in importance only to malaria. Related forms affect domestic animals as shown in Table 6.
Man acquires the infection by ingesting the cercariae on water chestnuts (Eliocharis tuberosa) and other aquatic salad vegetables when eating them raw or peeling them with the teeth. The pig is an important reservoir host. Heterophyes heterophyes (Dwarf fluke of man). This is a small (1-2 by 3-4 mm) fluke common in the Nile Delta and in foci in the Far East. It occurs attached to the wall of the jejunum and upper ileum, where it provokes mild inflammation resulting in colicky pains and mucous diarrhoea.
The adult worms are always intestinal parasites of the definitive host, while the immature stages are always tissue parasites of the intermediate host. Transmission is by ingestion of the infected intermediate host by the definitive host, either as food or by accident. Acanthocephala (Thorny-headed Worms) The members of this small phylum have an elongate, cylindrical body provided with a retractile proboscis armed by recurved hooks. An alimentary canal is lacking, nutriment being absorbed through the surface of the body.
An Introduction to Parasitology by John M. Watson and J. B. Stenlake (Auth.)