Definitely behaviour that is beneficial to toxoplasma, but absolutely not for the rodent.

绝对是有益于弓形虫的行为，但绝对不是啮齿动物。

A similar process happens with toxoplasma and mice which breeds in the digestive system of cats.

类似的过程发生在猫的消化系统中繁殖的弓形虫和老鼠身上。

We're talking about toxoplasmosis, a disease caused by toxoplasma gondii.

我们说的是弓形虫病，一种由弓形虫引起的疾病。

Regardless, toxoplasma has definitely benefited from humans to become one of the world's most successful parasites.

无论如何， 弓形虫确实受益于人类，成为世界上最成功的寄生虫之一。

There wasn't a good explanation for this until the discovery of the toxoplasma life cycle in cats.

一直以来科学家都没有办法解释为何如此，直到我们发现了弓形虫生命周期和猫之间的关联。

This is contrast to marsupials and monkeys in America and Europe who did evolve alongside cats and toxoplasma.

这与生活在欧洲及美洲的有袋动物和猴子形成了对比，因为它们演化的过程中，一直以来都和猫科动物及弓形虫有所接触。

New research shows that gray wolves get infected with toxoplasma by interacting with cougars and their feces, which carry the parasite.

新的研究表明，灰狼通过与携带寄生虫的美洲狮及其粪便相互作用而感染弓形虫。

Now, but wait. If animals and humans evolved to prevent susceptibility to toxoplasma, why did DD get it?

等等，回过头来，如果动物和人会演化出抵抗弓形虫的能力，那为什麽DD会发病呢？

Like all parasites, toxoplasma lives at the expense of its host, and needs its host to produce offspring.

与所有寄生虫一样， 弓形虫以宿主为代价生存，需要宿主才能产生后代。

As we know it today, toxoplasma gondii is a parasite whose infective life cycle depends on cats.

现今，我们知道，弓形虫这种寄生虫的生命周期循环必须仰赖猫。