In other words, they give you immunity.

换句话说，它具有免疫力。

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，类（对该病）没有免疫力。

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

当至少60%的对传染病具有免疫力的时候就达到了“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的自然免疫力可能对目前情况也会有帮助。

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

这是因为它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传播。

And it is this that seems to explain their immunity.

这正是他免疫力所在。

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

所以如果是免疫力差的，也不见得一定会死于流感。

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

它的攻击对象是老年，免疫力低下群，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》中可能也有类似的社会免疫力。

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

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，世界上没有具有免疫力。

COVID-19 is a new disease. Health officials say people don't have immunities to it.

新冠肺炎是一种新型疾病。卫生官员表示，对该疾病没有免疫力。

These medicines are specially made to boost immunity, especially against Covid-19.

这些药物专门用于增强免疫力，尤其是抗新冠肺炎。

If the vaccines fail, another option is to boost immunity passively by infusing monoclonal antibodies.

如果疫苗失效，另一个选择就是通过灌输单克隆抗体以被动提高免疫力。

Immunity to it doesn't last as long.

既往感染后的免疫力不会持续那么久。