![]() SIVcpz likely jumped to humans when hunters in Africa ate infected chimps, or the chimps’ infected blood got into the cuts or wounds of hunters. ![]() These two strains likely combined to form SIVcpz, which can spread between chimpanzees and humans. Chimps, the scientist later discovered, hunt and eat two smaller species of monkeys-red-capped mangabeys and greater spot-nosed monkeys-that carry and infect the chimps with two strains of SIV. In 1999, researchers identified a strain of chimpanzee SIV called SIVcpz, which was nearly identical to HIV. Scientists have traced the origin of HIV back to chimpanzees and simian immunodeficiency virus (SIV), an HIV-like virus that attacks the immune system of monkeys and apes.
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