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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Parasitic worms are found in several groups of the animal kingdom. Platyhelminthes (Flatworms) This phylum includes dorsoventrally flattened worms in which a body-cavity is lacking, the space between the body-wall and the wall of the alimentary canal being filled with loose parenchymatous tissue. Excretion is by means of flame-cells. The majority are hermaphrodite and possess very complex genitalia. Parasitic forms are provided with special organs for attachment to the host. The group includes a free-living class Turbellaria (Planarians), and two parasitic classes which have evolved therefrom.

Fresh-water fish As F. hepatica Liver and bile-ducts Fresh-water snails See above Liver and bile-ducts Bile-ducts and pancreatic duct Bile-ducts 1. Land snails 2. Unknown Liver and bile-ducts Sheep, goats, cattle Intermediate hosts Liver and bile-ducts Unknown Liver and bile-ducts Location in hosts Sheep, goats, cattle, pigs, dogs, donkeys, rabbits Cats Definitive hosts TABLE 4 Comment Varies—severe in sheep Digestive, disturbances, anaemia, emaciation, weakness, death See above See above N. America, Europe Europe, India Inflammation of bile- Malay States, ducts, hepatomegaly, British Guiana, Brazil loss of appetite, death Inflammation and Eastern Asia, occlusion of Brazil infected ducts, poor condition See above Pathogenic effects AN INTRODUCTION TO PARASITOLOGY two sporocyst generations to reach the cercarial stage.

Species of the genus Trichobilharzia are mainly involved. This form of itch is 7 8 9 10 11 Ventral sucker and reproductive organs of female schistosome (diagrammatic). Schistosoma haematobium—male, female and egg. Schistosoma monsoni—male, female and egg. Schistosoma japonicum—male, female and egg. Schistosoma bovis—male, female and egg. » Cattle, sheep, goats, dogs Sheep, goats, >> cattle, camels, equines Pigs, dogs ,, Sheep, goats, 99 cattle, cats, equines, camels Zebu ,, Veins of the nasal Sheep, goats, mucosa cattle, dogs Mesenteric and Ducks pelvic veins S.

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