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Molecular clones of SIVsm and SIVagm: experimental infection of macaques and African green monkeys.

We have investigated the ability of biologically-active proviral molecular clones of SIVsm and SIVagm to infect rhesus macaques, pig-tail macaques, and African green monkeys. Two clones of SIVsm were individually inoculated into four rhesus and four pig-tail macaques. All eight macaques became infected, and two have experienced a significant decline in absolute numbers of circulating CD4+ cells. None of three African green monkeys were infected by an SIVsm molecular clone. However, one of four African green monkeys did become infected by SIVsm after receiving lymphocytes directly from an SIVsm-infected rhesus macaque. A molecular clone of SIVagm infected three of four macaques and three of three African green monkeys. None of the three infected macaques had a significant decline in circulating CD4+ cells. Interestingly, infection of pig-tail macaques (but not rhesus macaques) with uncloned SIVagm induced a significant drop in circulating CD4+ cells. These data suggest that molecular clones of SIVsm and SIVagm can be used in experimental models of AIDS for the evaluation of viral gene functions and for the study of in vivo genetic variation.