An Introduction to Parasitology by John M. Watson and J. B. Stenlake (Auth.)

By John M. Watson and J. B. Stenlake (Auth.)

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They are unsegmented worms without suckers, having a cylindrical body which usually tapers at both ends. The straight, simple alimentary canal has an anterior mouth opening and a ventral, subterminal anus. The sexes are separate. The immature stages, generally known as larvae, are more correctly termed juveniles, since they differ from the adult only in their smaller size and lesser degree of differentiation. The life-cycle is exceedingly varied, ranging from direct and simple to very complex, indirect types.

Prevention involves personal cleanliness and avoidance of contact with pigs. There are no other important ciHate parasites of man or domestic animals. B. coli in pigs is apparently harmless. ) The following species of this genus are the most important sporozoan parasites of man: P. malariae which causes quartan malaria (characterised by a febrile paroxysm every 72 hours). F I G . 4. Malaria Parasites Upperfigure—Life-cycleof Plasmodium spp. *! Merozoite entering erythrocyte. Ring form (very young trophozoite).

Line beside each drawing indicates actual length of fluke. infected raw or under-cooked fish. Dogs, cats, foxes and other fish-eating mammals are reservoir hosts. This fluke, which closely resembles H. heterophyes in size, form, life-cycle and pathogenesis, is very common in the Far East, and has also been reported from Spain, the Balkan States and Palestine. The snail host is Semisulcospira libertina. Man contracts the infection by eating in­ fected raw or under-cooked fish. Various fish-eating birds and mammals, including the pelican, are reservoir hosts.

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