In contrast to the earlier observed inhibition of virus expressing reference BaL and YU-2 envs by TGF-β1 when TZM-bl cells were used as targets (Figure 4A), only YU-2 was significantly inhibited by TGF-β1 when NOMI cells were used to measure virus infection (Figure 5B). This evidence concerns the gene TGFB1 and viral infectious disease.