| 翻訳と辞書 |
| Trypanosoma lewisi ： ウィキペディア英語版 |
Trypanosoma lewisi
''Trypanosoma lewisi'' is a parasite of ''Rattus'' species and other rodents such as mice and kangaroo rats in America. Among these host species are two endemic species of rats: ''Rattus macleari'', now believed to be extinct, and ''Rattus nativitatis''. It is not very clear whether or not the same lewisi parasite infects both species. However, both parasites are very similar. The northern rat flea, ''Nosopsyllus fasciatus'' acts as the vector for the parasite, harboring the epimastigote stage in its midgut. The trypomastigote is the stage that is present in the main host, the rodent. The epimastigote form attaches itself to the rectum of the insect using its flagella to burrow through the rectal walls. The parasites also appear in the flea's feces. Ingestion of either the flea or its feces during grooming infects the host rodent with the parasites. ''T. lewisi'' is normally non-pathogenic but is known to have produced fatal infections in rats.
==History==
In the 1900s, a parasitologist noticed that ''Rattus macleari'', a species of rat endemic to Christmas Island, were becoming sick. The suspected cause was a species of trypanosomes. There was no proof that this was actually correct until scientists from the American Museum of Natural History deposited some rats that had been collected from Christmas Island as specimens into museums. Scientists argue that ''Trypanosoma lewisi'' is partially or wholly responsible for the subsequent extinction of ''Rattus macleari''. The parasites were transmitted from fleas infesting the then recently introduced black rats (''Rattus rattus'').
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Trypanosoma lewisi」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|