Figure 1. SIV infection of Chinese rhesus monkeys.

Six animals were intravenously inoculated with SIVmac239 (10³ TCID50). Blood samples were collected from the animals at the indicated time points postinfection. A: Plasma levels of SIV GAG gene RNA were measured by real-time PCR. B: CD4/CD8 ratios were measured by flow cytometry. C: Average SIV loads and CD4/CD8 ratios (mean ± SEM) of SIV-infected animals.