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The Geohelminths - Ascaris, Trichuris and Hookworm (Hardcover, 2002 ed.)
Loot Price: R5,476
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The Geohelminths - Ascaris, Trichuris and Hookworm (Hardcover, 2002 ed.)
Series: World Class Parasites, 2
Expected to ship within 10 - 15 working days
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The soil-transmitted nematode parasites, or geohelminths, are -
called because they have a direct life cycle, which involves no
intermediate hosts or vectors, and are transmitted by faecal
contamination of soil, foodstuffs and water supplies. They all
inhabit the intestine in their adult stages but most species also
have tissue-migratoryjuvenile stages, so the disease manifestations
they cause can therefore be both local and systemic. The
geohelminths together present an enormous infection burden on
humanity. Those which cause the most disease in humans are divided
into three main groupings, Ascaris lumbricoides (the large
roundworm), Trichuris trichiura (whipworm), and the blood-feeding
hookworms (Ancylostoma duodenale and Necator americanus ), and this
book concentrates on these. These intestinal parasites are highly
prevalent worldwide, A. lumbricoides is estimated to infect 1471
million (over a quarter ofthe world's population), hookworms 1277
million, and T. trichiura 1049 million. The highly pathogenic
Strongyloides species might also be classified as geohelminths, but
they are not dealt with here because the understanding of their
epidemiology, immunology and genetics has not advanced as rapidly
as for the others. This is primarily because of the often covert
nature of the infections, with consequent difficulties for
analysis. If there is ever a second edition of this book, then
there will hopefully be much to say about this infection.
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