该病毒的猴版——猴免疫缺陷病毒（SIV）对猿猴所引起的感染大为温和。
The simian version of the virus causes a much milder infection in apes and monkeys. Photograph: Corbis
例如，HIV是在100年前从猴免疫缺陷病毒，或叫SIV的黑猩猩病毒演化而来。
H.I.V. evolved about a century ago from a chimpanzee virus known as simian immunodeficiency virus, or S.I.V..
艾滋病被认为起源于非洲，那里的黑猩猩和猿携带了一种类似HIV的病毒，叫SIV(猴免疫缺陷病毒)。
AIDS is thought to have originated in Africa, where monkeys and apes harbor a virus similar to HIV called SIV (simian immunodeficiency virus).
艾滋病病毒的灵长类动物版本被称为猴免疫缺陷病毒（SIV），但大多数感染此病毒的猿猴并没有显示任何疾病症状。
The primate version of the virus that causes AIDS is called simian immunodeficiency virus (SIV), but most apes and monkeys that are infected with it show no symptoms of illness.
猴免疫缺陷病毒（SIV）为猴艾滋病的病原体，在许多方面与HIV和人类艾滋病相似，是研究人类艾滋病的极好模型。
The simian immunodeficiency virus (SIV) is the pathogens of simian AIDS, similar with HIV and human AIDS, is a good model of human AIDS.
猴免疫缺陷病毒（SIV）为猴艾滋病的病原体，在许多方面与HIV和人类艾滋病相似，是研究人类艾滋病的极好模型。
The simian immunodeficiency virus (SIV) is the pathogens of simian AIDS, similar with HIV and human AIDS, is a good model of human AIDS.
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