Another practical point is that the type of malarial parasite used in this and many other experiments is not actually one that causes human disease.

另一问题是，在这个试验以及许多其他试验中使用的疟原虫的类型中，没有一种是实际上导致人类疟疾的。

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Human African trypanosomiasis takes two forms, depending on the parasite involved.

非洲人类锥虫病有两种类型，取决于涉及的寄生虫。

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Scientists have long speculated about just how ancient the disease is, and when the human malaria parasite originated, with wildly varying estimates from 10, 000 years to several million years ago.

科学家推测，寄生虫引发的人类疟疾可以追溯到1万年前，甚至几百万年。

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Agriculture Department spokeswoman Denise Feiber says the menacing creatures also carry a human parasite called rat lungworm, which is a form of meningitis and potentially deadly.

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Just as researchers use mice to model human physiology, so they use this parasite, Plasmodium berghei, to model the lethal Plasmodium falciparum.

ECONOMIST: Recruiting mosquitoes to fight malaria

Another practical point is that the type of malarial parasite used in this and many other experiments is not actually one that causes human disease.

ECONOMIST: Recruiting mosquitoes to fight malaria