如果这种病毒能够通过空气传播，或者如果一名感染者在不知情的情况下进入了人口密集的地区，那么埃博拉可能已经成为一种全球流行病。
If the virus had been capable of spreading through the air, or if one infected person had unknowingly entered a large population center, Ebola might have become a worldwide epidemic.
我们知道艾滋病病毒和埃博拉病毒是起源于非洲的……那么为什么不是这个呢？
We know that HIV and the Ebola virus originated in Africa… so why not this?
先有的病例引发后续病例的速率，流行病学家称之为r0，是埃博拉病毒传播的关键变量。
The rate at which cases give rise to subsequent cases, which epidemiologists call R0, is the key variable in the spread of Ebola.
先有的病例引发后续病例的速率，流行病学家称之为r0，是埃博拉病毒传播的关键变量。
The rate at which cases give rise to subsequent cases, which epidemiologists call R0, is the key variable in the spread of Ebola.
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