在野外环境中，黑猩猩是受与艾滋病毒相关的一种病毒感染而大量生病的第一种灵长类动物。
Chimpanzees are the first primate shown to get sick in the wild in significant Numbers from a virus related to HIV.
人在接过种后产生的抗体可以同时对牛痘病毒感染及其密切相关的天花病毒感染起到保护作用。
The vaccinated person developed antibodies which protected both against the cowpox infection and against the closely related virus that caused smallpox.
提前治疗的相关费用可能因多种因素而抵销，如住院费用降低，因减少病假而提高生产力，艾滋病孤儿人数减少以及艾滋病毒感染人数下降。
The associated costs of earlier treatment may be offset by decreased hospital costs, increased productivity due to fewer sick days, fewer children orphaned by AIDS and a drop in HIV infections.
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