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Intrarectal inoculation of SHIV-1157ipd3N4. Five Chinese-origin rhesus monkeys (A) and eight Indian-origin rhesus monkeys (B) were inoculated intrarectally with SHIV-1157ipd3N4 stock with concentrations noted in the text. Viral loads were measured at indicated time points postinoculation. The dashed lines indicate the lower level of sensitivity of the RT-PCR assay (50 copies/ml).
