人类免疫力缺乏病毒（HIV）是一种感染人类免疫细胞，从而破坏人体免疫系统的反转病毒。
The human immunodeficiency virus (HIV) is a retrovirus that infects cells of the human immune system, destroying or impairing their function.
卫生官员最近才发现该男子的人类免疫力缺乏病毒(HIV)测试呈阳性，已通知420名女士，警告她们可能会染上艾滋病。
Health officials have only recently discovered the human immunodeficiency virus (HIV) testing positive, 420 had informed the President, warning they may be infected with AIDS.
城市型黄热病：如果受感染的人把病毒带入人口稠密的地区，而这些地区有很多人缺乏免疫力，并有伊蚊生存繁殖，就会发生大流行。
Urban yellow fever: Large epidemics occur when infected people introduce the virus into densely populated areas with a high number of non-immune people and Aedes mosquitoes.
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