The success of any given vaccine depends on so-called herd immunity, in which a high rate of immunization in a population helps to protect those individuals who are not immune.

任何特定疫苗的成功都依赖于所谓的免疫屏障，即通过高比率的免疫人群来保护不免疫的个体。

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The worst cases involve extensive lung damage, possibly as the result of an excessive immune response among the most robust segment of the population.

最糟糕的病例包括大面积的肺损伤，可能是由于这个最强健群体存在过度的免疫反应所导致的。

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09052823】 Thank parasites for making some of our immune proteins into the inflammatory defenders they are today, according to a population genetics study in the Journal of Experimental Medicine.

最近《实验医学杂志》上一篇关于种群遗传学的论文提出一个观点：人体免疫蛋白之所以有今天这样的疾病抵御能力，还得归功于各种病菌。

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"They don't make the population immune, but they buy you time, either by preventing influenza from getting into the community or slowing down the spread, " Markel said.

CNN: Scientists dig for lessons from past pandemics

Diabetics who are infected with TB become ill with the disease at three times the ratio of the general population because their immune systems are compromised, said Dr. Seaworth, who is also a professor of medicine at the University of Texas Health Science Center-Tyler.

WSJ: TB's Global Resurgence Amplifies U.S. Risk

It is hoped this combination will stimulate the immune system to recognising and destroying cancer cells, while at the same time preventing rapid re-population by any cells not killed off by the immune defences.

BBC: New trial targets kidney cancer