Tsetse flies are found just in sub-Saharan Africa though only certain species transmit the disease.

采采蝇仅在南撒哈拉非洲存在，但只有某些种类的采采蝇会传播该病。

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The disease, transmitted mainly by tsetse flies, is prevalent in 37 countries among the poorest of the world.

这一疾病主要是通过采采蝇传播，在全世界最贫困的37个国家中流行。

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The disease is caused by the trypanosoma parasite. It is spread to humans through the bite of infected tsetse flies.

这种疾病由于锥体寄生虫引发，它是通过被感染的采采蝇叮咬传染给人类的。

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It is spread to humans through the bite of infected tsetse flies.

VOA: special.2010.01.04

The white sun was still cool and the animals were cautiously on the move: wildebeest were calving and zebras grazed, their brush-like tails swishing at clouds of pestering tsetse flies.

BBC: On the hunt with Hemingway