1.It might have happened when you were a child and now it [the infectious agent] is long gone, but it sets you up for a problem later in life.
你也许在小时候受过一次感染，而现在它（那个感染源）已经不复存在，但它为你后来的某个疾病埋下了病根。
2.Dissemination of the infectious agent (M. tuberculosis, fungi) may produce a similar pattern in other organs.
感染性播散在其它器官中也可以产生类似的病变。
3.For the sake of public health, the American Red Cross should be trying to identify the infectious agent that is in our blood.
为了公众健康，美国红十字会应设法确定传染病的代理人，是在我们的血液。
4.a parasitic or infectious agent was sought for beriberi and other disease which turned out to be due to completely different aetiologies.
例如，脚气病以及其它疾病病原是由寄生虫或感染性因子导致的，然而，最后证实完全不是。
5.The cause of FSE is an infectious agent called a prion, and prion protein accumulates in the brain tissue as a substance called amyloid.
FSE的病原是一种感染性蛋白，这种感染性蛋白像淀粉质一样在脑组织积累。
6.I reckon a lot of these mysterious chronic diseases are related to some infectious agent that's been a trigger.
我猜测很多神秘的慢性疾病都和一些感染源的激发有关。
7.Some experts thought the agent must be a drug or chemical because no infectious agent fit.
因为没有传染病适合艾滋病的症状，一些专家认为诱因肯定是某种药物或化学物质。
8.Polyoma virus: Minute infectious agent normally present in extremely small amounts in wild mice without causing obvious ill effects.
多瘤病毒：存在于野鼠身上、数量极少、致病力不强的一种感染性小病原体。
9.There is strong evidence that this infectious agent promotes diseases of both plants and mammals, which is very rare.
有强烈的证据表明，这种传染性的病原体既促进植物的疾病，也促进哺乳动物的基本，这极其罕见。
10.Under normal circumstances the immune system will eradicate an infectious agent using antibodies and T cells as its main weapons.
在正常情况下免疫系统会以抗体和T细胞作为主要武器来消灭入侵者。