CTLA4 and infection: CTLA-4’s expression kinetics correlated well with the infection kinetics of HIV GKO/VSV-G (p < 0.05 in 20/20 donors, mean R-square = 0.86) and HIV GKO/LAI (p < 0.05 in 18/20 donors, mean R-square = 0.74), whereas the correlation was only partial with HIV GKO/BaL (p < 0.05 in 12/20 donors, mean R-square = 0.75).