It is spread by the bite of an infected tsetse fly (Glossina Genus), a species native to the African continent.
它通过非洲大陆当地特有的物种即受感染的采采蝇(舌蝇属)的叮咬传播。
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They are transmitted to humans by tsetse fly (Glossina genus) bites which have acquired their infection from human beings or from animals harbouring the human pathogenic parasites.