But the reason you get these continual blips is that this virus is there perpetually in the environment in animal reservoirs.

但之所以埃博拉可以引起持续的躁动是因为这种病毒在环境里、在动物体内一直存在。

Zoonotic illnesses are really hard to get rid of, because they have an animal reservoir.

人畜共患疾病真的很难摆脱，因为它们有一个动物宿主。

" The real work we are doing here is to trace back from the first cases back to an animal reservoir" .

" 我们在这里做的真正工作是从最初的病例追溯到动物宿主。"

For example, the type of pathogen, how often humans come into close contact with its animal reservoir, existing immunity, and so on.

比如病原体的种类、人类近距离接触其动物宿主的频率、现有的免疫力等等。

It'll take a few more flu seasons to know for sure if it's truly extinct or just hiding out in an animal reservoir.

还需要几个流感季节才能确定它是真的灭绝了还是只是藏在动物宿主中。

Our vaccination campaign against smallpox worked because the vaccine was highly protective against infection and smallpox had no close animal reservoir in which it could hide.

我们针对天花的疫苗接种运动之所以奏效，是因为疫苗对感染具有高度保护作用，而且天花没有可以隐藏的封闭动物宿主。