As shown in Table 1, control antibody GPI-FluIgG03-transduced TZM-bl cells were highly susceptible to infection with the eight HIV-1 isolates including five CCR5-tropic viruses (JR-CSF, RHPA.c/2635, THRO.c/2626, CH077.t/2627, and MJ4), two CXCR4-tropic viruses (NL4-3 and LAI.2), and one dual-tropic virus (89.6). This evidence concerns the gene CXCR4 and infection.