" The story about Toxoplasma gondii manipulating the behavior of its host is simply fascinating."

“弓操纵宿主行为的故事简直令人着迷。”

But there is a microorganism called Toxoplasma that needs both cats and rodents to complete its life cycle.

有一种寄生叫弓需要老鼠来繁殖。

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

现今，我们知道，弓这种寄生的生命周期循环必须仰。

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，直到我们发现了弓生命周期间的关联。

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猴子成了对比，因为它们演化的过程中，一直以来都科动物及弓有所接触。

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

现今，我们会告诉怀胎的孕妇避免清理砂，以免将弓垂直感染给还在体内的婴儿。

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

等等，回过头来，如果动物人会演化出抵抗弓的能力，那为什麽DD会发病呢？

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一样变成潜伏的疾病，但却是个人们微生物共同生活在一起的好例子。