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.
一些猴子死亡，至少有四人受到感染，虽然他们都没有出现临床疾病。
Several monkeys died, and at least four people were infected, although none of them suffered clinical illness.
美国农业官员指出，美国只发生过两起记录在案的疯牛病病例，而且受到感染的牛肉并没有进入食品供应系统。
American agriculture officials point out there have only been two documented cases of mad cow disease in U.S. cattle - neither of which made it into the food supply.
卫生保健工作者在治疗埃博拉患者时也往往受到感染，这是由于在密切接触过程中，没有采取正确的感染预防措施和适当的隔离护理程序。
Health care workers have frequently been infected while treating Ebola patients, through close contact without correct infection control precautions and adequate barrier nursing procedures.
他们并没有打算让利用红外热成像摄像机快速鉴定可能受到感染的动物的方法成为一种诊断性检测方法。
Their method, which USES IRT cameras to quickly identify potentially infected animals, is not intended to be a diagnostic test.
伊朗方面承认Bu•shehr核电站的一些电脑受到感染，但目前还没有造成损害。
Iran admits that some computers at its Bushehr nuclear plant were infected, but says no damage was done.
大多数情况下都是潜伏感染，即患者虽然受到感染，但没有症状，不太可能传染给他人。
Most cases are latent, meaning patients are infected but have no symptoms and are very unlikely to infect anyone else.
疾病流行的点燃仅仅就是卫生机构没有发现的一个病例，逃离监测系统的一位受到感染的接触者，或是一次不安全的埋葬仪式而已。
All it takes is a single undetected case in a health facility, one infected contact fleeing the monitoring system, or one unsafe burial to ignite a flare-up of cases.
对那些每天正在受到感染的美国人来说还没有。
大多数受到感染的人都没有症状，因而并不知道他们携带有病毒，这就是医学上所称的无症状期，如前所述，这一时期能够持续8年之久。
Most infected people have no symptoms and do not know that they are carrying the virus. This is technically termed the asymptomatic stage and can last, as we have said, up to eight years.
大多数受到感染的人都没有症状，因而并不知道他们携带有病毒，这就是医学上所称的无症状期，如前所述，这一时期能够持续8年之久。
Most infected people have no symptoms and do not know that they are carrying the virus. This is technically termed the asymptomatic stage and can last, as we have said, up to eight years.
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