Similar experiments performed with HIV-1BaL resulted in 1.6±0.2 fold increase (n = 5, p<0.05) in viral replication when tissues were pre treated with IL-7 and then cultured without IL-7, and 2.8±0.8 fold increase (n = 5, p<0.05) when tissues were pre treated with IL-7 and then cultured in the presence of IL-7 until day 3 post infection (Figure 4). This evidence concerns the gene IL7 and infection.