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.
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
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
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