But it also has struggled with racial division, poverty and high rates of HIV/AIDS infection.

VOA: special.2010.06.09

Now in some--in the chronic respiratory diseases there's some infection but most of the other things are caused by lifestyle or by other factors, not the infectious diseases.

如今一些,如慢性呼吸道疾病,有一些是传染所得,但大多数,都是生活方式或其他因素导致的,而不是感染性疾病

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

So, one that perhaps does not reproduce in such high numbers that you create an overwhelming infection, but one that still goes through its lifecycle but is limited in its effect.

因此,一方面这些病毒不会大量复制,从而不会导致暴发性的感染,另一方面,它依旧在进行生命周期循环,只不过对其效用进行了限制

耶鲁公开课 - 生物医学工程探索课程节选

But those with weak natural defenses may develop a severe infection.

VOA: special.2009.05.26

But children in developing nations lived under the constant risk of infection until more recently, when an international service club took aim at eliminating the disease.

VOA: standard.2010.08.02