In HIV-1-infected lymphoid tissues IL-7 25 ng/mL increased the fraction of Ki-67-positive HIV-1-infected CD4+ T cells on average 2.3±0.6 fold, from 1.9±0.3% to 4.0±1.0% of CD8− p24gag+ T cells for HIV-1LAI.04 (n = 6, p<0.05), and 1.5±0.2 fold, from 5.2±0.8% to 7.8±1.2% of CD8− p24gag+ T cells for HIV-1BaL on day 9 post infection (n = 6, p<0.05) (Figure 7 A, B). This evidence concerns the gene CD4 and infection.