CD34 and infection: On the other hand, for all the HIV-infected samples tested (n = 12), the mean CD4+ percentage was significantly higher in p24+CD34+CD7+ cells (mean ± SD: 62.0 ± 18.8) than in p24+CD34+CD7− cells (mean ± SD: 33.48 ± 14.6) at week 3 post infection (Figure 3I), possibly reflecting CD4 downregulation in productively infected CD34−CD7−CD4+ cells.