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1·It first infects you because you breathe in some of the infectious agents.

只要吸入病原体，你就会被感染。

2·These are cells of the type that HIV infects.

而这些细胞正是艾滋病毒感染的那一类细胞。

3·Where prevention efforts decline, HIV infects more people.

预防努力退步，艾滋病毒就会感染更多的人。

4·Cytomegalovirus (CMV) is a virus that infects the whole body.

巨细胞病毒(CMV)是一种可以感染全身的病毒。

5·You catch a cold when a virus infects your upper respiratory system.

当上呼吸系统感染了病毒，人就会得感冒。

6·Cryptococcosis is caused by a fungus that primarily infects the brain.

引起隐球菌病的真菌主要感染大脑。

7·We know that the novel H1N1 virus preferentially infects younger people.

我们知道这种新的H1N1病毒更多地感染年轻人。

8·Acanthamoeba is a bacteriophage, a class of virus that infects bacteria.

a canthamoeba是噬菌体的一种。噬菌体是一类专门感染细菌的病毒。

9·Neisseria meningitidis only infects humans; there is no animal reservoir.

脑膜炎奈瑟菌仅感染人类，不存在动物宿主。

10·The parasite infects approximately one-third of the world's human population.

这种寄生虫感染了全世界将近三分之一的人口。