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).

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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..

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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..

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