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Ancylostoma ceylanicum
''Ancylostoma ceylanicum'' is a parasitic roundworm belonging to the genus ''Ancylostoma''. It is a hookworm both of humans and of other mammals such as dogs, cats, and golden hamsters. It is the only zoonotic hookworm species that is able to produce symptomatic infections in humans, with the majority of cases being in Southeast Asia.
==Discovery and history==
Since the description of ''Ancylostoma ceylanicum'' by Arthur Looss in 1911, and ''A. braziliense'' by Gomes de Faria in 1910, the two species were considered synonymous because of their apparent similarities in almost all respects. In 1913, comparison of specimens from human, dog, cat and lion infections in India led to the conclusion that they were definitely identical. In 1915 Gomes de Faria described the anatomical structures and concluded that the two were distinct species. Until 1921 ''A. ceylanicum'' was accepted as a valid species. However, in 1922 Gordon made an exhaustive comparison from specimens collected in Brazil, South Africa and India, and he failed to identify any distinction. Other parasitologists also became convinced that the two names were synonymous. In 1951 Biocca made an elaborate study of different hookworms in the collection of London School of Hygiene and Tropical Medicine, the Liverpool School of Tropical Medicine and personal collections. He finally identified the defining characters between the two for classifying them as distinct species, which eventually gained general acceptance.
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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