MML-specific CD4⁺ T cells are not preferentially infected with SIV 2 weeks after MML vaccination. CD4⁺ T cells from SIV-infected RMs were sorted into 4 populations: naive (circles), memory (squares), effector (triangles), and MML-specific (inverted triangles) cells. Quantitative real-time PCR was used to determine the SIV infection frequency of each subset after neo MML vaccination (A) or recall MML vaccination (B). Horizontal bar represents median.