In other words, they give you immunity.

换句话说，它们使你具有免力。

Or whether the patient is partially immune, thanks to past exposures.

由于过去病史，一些病会产生出对此免力。

Health officials say people don't have immunities to it.

卫生部官员表示，类（对该病）没有免力。

If enough people have immunity, they can kind of shield the virus from reaching others.

如果足够多有免力，他们可以成为屏障 使病毒无法传播给他。

It's when at least 60 percent of a population becomes immune to an infectious disease.

当至60%对传染病具有免力时候就达到了“群体免”。

Natural immunity from those who've recovered from the disease could factor in as well.

那些从疾病中康复然免力可能对目前情况也会有帮助。

He had developed immunity to the more dangerous disease.

他已对这种更危险疾病产生了免力。

This is because they're equipped with genes that provide immunity against numerous pathogens.

这是因为它们具备能对众多病原体提供免力基因。

That every American has the same level of immunity.

每个美国都有同等程度免力。

This immunity is spreading across the world as we speak.

这种免力正在朝全球传播。

Do you think it could be because of a weak immune system?

你觉得会不会是因为你免力太弱了呢？

And it is this that seems to explain their immunity.

这正是他们免力所在。

So if you're in that middle group, you're not likely to die from it.

所以如果你是免力差，你也不见得一定会死于流感。

Scientists first genetically modified some papaya plants so they were immune to the virus.

科学家首先对一些木瓜植物进行了基因改造，使其对病毒具有免力。

It targets older adults, people with weakened immune systems, and pregnant women and their newborns.

它攻击对象是老年，免力低下群，孕妇以及新生婴儿。

There might be a similar social immunity dynamic at play in The Last of Us.

《最后生还者》中可能也有类似社会免力。

You'd have to actually experience the infection to develop immunity.

你必须亲身经历感染才能产生免力。

But vaccines cover the diseases you don't have immunity against.

但是苗负责是那些你没有免力疾病。

Another series of letters from an American private provides a good example of acquired immunity.

另一组来美国士兵信件是“获取免力”一个很好例子。

For one thing, when it appeared, no one on Earth had immunity.

首先，它出现时，世界上没有具有免力。