And here's the rabies virus, another mind-altering parasite.

狂犬病毒 是另一个改变宿主神智的例子。

A person may think he has avoided the rabies virus.

人们可能会认为他没有感染狂犬病病毒。

But soon, he or she will begin to experience neurological signs of the rabies virus.

但很快，他或她就会开始出现狂犬病毒引起的神经症状。

The rabies virus may cause that snarling, slobbering behavior by putting the immune system into overdrive.

狂犬病毒会导致动物 狂吠及不停地流口水是取决於牠使免疫系统瘫痪。

You couldn't even detect the rabies virus in their brain.

TIM：你甚至无法检测到他们大脑中的狂犬病病毒。

So, I went out and I collected cow brains, because that's where you get rabies viruses.

所以， 我出去收集牛脑，因为那是你感染狂犬病病毒的地方。

To infect its host, the rabies virus hops from neuron to neuron, traveling all the way into the brain.

为了感染宿主，狂犬病病毒从一个神经元跳到另一个神经元，一直传播到大脑。

Why? Well, even though they are mammals, they have relatively low body temperatures, and that might make it hard for the rabies virus to survive in opossum. Now, that's random.

为什么? 嗯, 即使作为哺乳动物, 它们的体温也相对较低, 这就使得狂犬病毒在负鼠体内很难生存。现在这只是偶然所致。