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Animal trypanosomiasis
Nagana, also known as nagana pest or animal African trypanosomiasis, is a disease of vertebrate animals. The disease is caused by trypanosomes of several species in the genus ''Trypanosoma'' such as ''Trypanosoma brucei''. ''Trypanosoma vivax'' causes nagana mainly in West Africa, although it has spread to South America. The trypanosomes infect the blood of the vertebrate host, causing fever, weakness, and lethargy, which lead to weight loss and anemia; in some animals the disease is fatal unless treated. The trypanosomes are transmitted by tsetse flies.〔(【引用サイトリンク】title=Human African trypanosomiasis (sleeping sickness) )〕
An interesting feature is the remarkable tolerance to nagana pathology shown by some breeds of cattle, notably the N'Dama – a West African ''Bos taurus'' breed. This contrasts with the susceptibility shown by East African ''Bos indicus'' cattle such as the zebu. Most wild African animals are also resistant.
This disease is the nonhuman animal counterpart of human African trypanosomiasis, also known as sleeping sickness.
==References==
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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