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Necator americanus
''Necator americanus'' is a species of hookworm (a type of helminth) commonly known as the New World hookworm. Like other hookworms, it is a member of the phylum Nematoda. It is a parasitic nematode that lives in the small intestine of hosts such as humans, dogs, and cats. Necatoriasis - a type of helminthiasis - is the term for the condition of being host to an infestation of a species of ''Necator''. Since ''N. americanus'' and ''Ancylostoma duodenale'' (also known as Old World hookworm) are the two species of hookworms that most commonly infest humans, they are usually dealt with under the collective heading of "hookworm infection". They differ most obviously in geographical distribution, structure of mouthparts, and relative size.
''Necator americanus'' has been proposed as an alternative to ''Trichuris suis'' in helminthic therapy.
==Morphology==
This parasite has two dorsal and two ventral cutting plates around the anterior margin of the buccal capsule. It also has a pair of subdorsal and a pair of subventral teeth located close to the rear. Males are usually 7–9 mm long, whereas females are about 9–11 mm long. The typical lifespan of these parasites is three to five years. They can produce between 5000 and 10,000 eggs per day.〔Roberts, Larry S., and John Janovy, Jr. Foundations of Parasitology. Seventh ed. Singapore: McGraw-Hill, 2006. Print.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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