CD4 and infection: In HIV-1LAI.04-infected lymphoid tissues, IL-7 25 ng/mL increased Bcl-2 expression in HIV-1-infected CD4+ T cells on average 2.3±0.1 fold and 2.4±0.1 fold on day 6 and 9 post infection, respectively (n = 8, p<0.0001) (Figure 6B).