In other words, they give you immunity.

换句话说，它们使你具有免疫力。

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

由于过去的病史，一些病人会产生出对此的免疫力。

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

卫生部官员表示，人类（对该病）没有免疫力。

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

如果足够多的人有免疫力，他们可以成为屏障 使病毒无法他人。

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

当至60%的人对染病具有免疫力的时候了“群体免疫”。

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

那些从疾病中康复的人的自然免疫力可能对目前情况也会有帮助。

He had developed immunity to the more dangerous disease.

他已对这种更危险的疾病产生了免疫力。

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疫力的基因。

That every American has the same level of immunity.

每个美国人都有同等程度的免疫力。

This immunity is spreading across the world as we speak.

这种免疫力正在朝全球。

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

你觉得会不会是因为你的免疫力太弱了呢？

And it is this that seems to explain their immunity.

这正是他们免疫力所在。

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

所以如果你是免疫力差的人，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，使其对病毒具有免疫力。

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

它的攻击对象是老年人，免疫力低下人群，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》中可能也有类似的社会免疫力。

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疫力。

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

但是疫苗负责的是那些你没有免疫力的疾病。

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

另一组来自美国士兵的信件是“获取免疫力”的一个很好的例子。

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

首先，它出现时，世界上没有人具有免疫力。