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

ISBN-10: 1483256723

ISBN-13: 9781483256726

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32 PROTOZOOLOGY Other Sporozoa Parasitic in Man Isospora hominis. This is a widely distributed but relatively uncommon parasite of man in temperate climates. It inhabits the small intestine and forms small (20-33 by 10-19 microns), elongateovoid oöcysts with a smooth two-layered wall, which pass out in the faeces. The parasite within the oöcyst divides to form two sporoblasts, each of which secretes a cyst-wall around itself and divides therein to produce four, long, slender sporozoites. If the oöcysts are ingested by a fresh host, the sporozoites emerge on reaching the ileum and invade cells of the epithelial lining.

A number of trematode species infect the liver of domestic animals, as set forth in Table 4. Pulmonary Trematodes There is only one important trematode parasite of the human lung. Paragonimus westermani (Oriental lung-fluke). This is a plump, fleshy, ovoidflukeof medium size (8-16 by 4-8 by 3-5 mm), having a spiny integument. It is common in man in many parts of the Far East, including China, Japan, Korea, Formosa and South-East Asia, occurring encapsulated in the lungs. The eggs are coughed up and either voided in the sputum or swallowed and discharged in the faeces.

Blood Trematodes Three species of the trematode genus Schistosoma are important parasites of the human circulatory system in warm climates, namely: S. haematobium (Africa and the Middle East, Madagascar and Mauritius). 5. mansoni (Africa and the Middle East, West Indies, South America). S. japonicum (Far East especially China, Japan, Formosa, Celebes and the Philippines). The adult worms of all three species live in the visceral veins, to which they are adapted by their long, narrow, shape (male 8-15 by 0-5-1 mm) (female 20 by 0-25 mm).

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


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