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

绝对是有益于弓形虫行，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.

类程发生在猫消化系统中繁殖弓形虫和老鼠身上。

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

我们说是弓形虫病，一种由弓形虫引起疾病。

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，成世界上最成功生虫之一。

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何如此，直到我们发现了弓形虫生命周期和猫之间关联。

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有袋动物和猴子形成了对比，因它们演化程中，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.

新研究表明，灰狼通与生虫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，回头来，如果动物和人会演化出抵抗弓形虫能力，那什麽DD会发病呢？

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

与所有生虫一样， 弓形虫以宿主代价生存，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，弓形虫这种生虫生命周期循环必须仰赖猫。

Today, we tell pregnant women not to clean the cat's litterbox, for risk of transmitting toxoplasma to the unborn baby.

现今，我们会告诉怀胎孕妇避免清理猫砂，以免将弓虫垂直感染给还在体内婴儿。

Wolves infected with toxoplasma are more likely to wander away from their former pack to find a new one and are more risk-taking, more bold.

感染弓形虫狼更有可能离开原来狼群去寻找新狼群，而且更冒险，更大胆。

The wolves studied recently in Yellowstone National Park could be drifting near to the source of their infection, cougars, because toxoplasma reproduces only in the stomach of felines.

最近在黄石国家公园被研究狼可能漂流到它们感染源美洲狮附近，因弓形虫只在猫科动物胃里繁殖。

It also slows reactions and decreases concentration, which may be why one study found that people involved in traffic accidents were almost three times more likely to have toxoplasma.

它还会减慢反应并降低注意力，这可能就是什么一项研究发现发生交通事故人感染弓形虫可能性几乎高出三倍。

Hep. A may not be a latent infection in the same way that toxoplasma is, but it is another part of the human experience of living in a world where we coexist with microorganisms.

A型肝炎或许不会像弓浆虫一样变成潜伏疾病，但却是个人们和微生物共同生活在一起好例子。