这就是所谓群体免疫力。
“群体免疫性”低。
It is also why every few decades a flu strain appears with the genetic novelty to evade our herd immunity and wreak global havoc.
这也是为什么每过几十年就会出现一个流感株，它有着足够的基因改变来攻克人群的免疫，掀起全球范围的混乱。
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。
The vaccination rate for herd immunity varies by disease, but usually falls between 85% and 95%.
不同的疾病对群体免疫接种率的要求不同，但通常应在85%到95%之间。
There was a very significant negative association between the attack rate and the herd immunity (P<0.01).
罹患率与流行前群体免疫呈非常显著的负相关（P<0.01）。
By contrast several rich countries, including America, Britain, France and Italy, are below herd immunity.
与之相对的是，包括美国、英国、法国、意大利在内的发达国家低于群体免疫力的阈值。
The study also provided evidence of the so-called "herd immunity effect" in which unvaccinated older people benefit from the vaccination of children and infants.
该研究还提供了所谓“人群免疫效应”的证据，即接种了疫苗的婴幼儿使未接种过该疫苗的大龄人群受益。
Many of the childhood vaccinations rely on "herd-immunity" - a certain percentage of the population having the vaccine in order to protect those that do not, or cannot have it, from infection.
许多儿童疫苗依赖于“群体免疫”——一定比例的人口接种某些疫苗是为了预防那些没有接种或不能接种的人受到感染。
Many of the childhood vaccinations rely on "herd-immunity" - a certain percentage of the population having the vaccine in order to protect those that do not, or cannot have it, from infection.
许多儿童疫苗依赖于“群体免疫”——一定比例的人口接种某些疫苗是为了预防那些没有接种或不能接种的人受到感染。
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