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Ancylostoma duodenale is a species of the roundworm genus Ancylostoma.It is a parasitic nematode worm and commonly known as the Old World hookworm. It lives in the small intestine especially the jejunum [citation needed] of definitive hosts, generally humans, [2]: 307–308 [3] where it is able to mate and mature.
The male and female pinworms mate in the ileum (i.e., last part of the small intestine), [19] whereafter the male pinworms usually die, [23] and are passed out with stool. [24] The gravid female pinworms settle in the ileum , caecum (i.e., beginning of the large intestine ), appendix and ascending colon , [ 19 ] where they attach themselves to ...
N. americanus is generally smaller than A. duodenale with males usually 5 to 9 mm long and females about 1 cm long. Whereas A. duodenale possesses two pairs of teeth, N. americanus possesses a pair of cutting plates in the buccal capsule. Additionally, the hook shape is much more defined in Necator than in Ancylostoma. [11]
The difference model has roots in the studies of John Gumperz, who examined differences in cross-cultural communication.While the difference model deals with cross-gender communication, the male and female genders are often presented as being two separate cultures, hence the relevance of Gumperz's studies.
Like many other worms, the female worm is larger than the male. Also, the females are more difficult to distinguish because the teeth sizes appear very similar among the various species of Ancylostoma. Male worms, however, have two broad lateral lobes and a smaller dorsal lobe with rays on the copulatory bursa.
Ancylostoma is a genus of nematodes that includes some species of hookworms. Species include: Ancylostoma braziliense, commonly infects cats, popularly known in Brazil as bicho-geográfico Ancylostoma caninum, commonly infects dogs Ancylostoma ceylanicum Ancylostoma duodenale Ancylostoma pluridentatum, commonly infects sylvatic cats
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. [2]
N. americanus is the more common hookworm, while A. duodenale is more geographically restricted. Unlike other STHs, in which school-age children are most affected, high-intensity hookworm infections are more frequent in adults, specifically women. Roughly 44 million pregnant women are estimated to be infected.