Abstract
Experimental leprosy studies using Mycobacterium leprae inoculum isolated from a sooty mangabey monkey (SMM) resulted in the accidental discovery that SMM's asymptomatically carry simian immunodeficiency virus (SIV) that is pathogenic in macaques. We showed that the SMM virus, SIVDelta, was antigenically related to SIVmac, which had been identified in macaques, and to the human immunodeficiency virus (HIV). Similar asymptomatic natural SIV infections had been reported in African green monkeys (AGM). Our results together with observations of others led us to propose that both SIVmac and SIVDelta originated in SMM and that SIV emerged in humans as a result of early African nonhuman primate SIV trans-species infections in humans.
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