We also monitored HIV infection in vector-induced CD4 T cells for up to 9 days post exposure and found that ALVAC-induced CD4 T cells remained resistant to HIV on day 9 post viral exposure (p24+: 0.5%), whereas Ad5 vector-specific CD4 T cells were still readily susceptible (p24+: 11.8%) (S2 Fig). This evidence concerns the gene CD4 and HIV infectious disease.