CD4 and infection: Consistently, we observed that ALVAC-induced CD4 T cells were also less susceptible to AD17 TFV infection (p24+ %: 0.6%) as compared to Ad5 vector-induced CD4 T cells (p24+ %: 3.8%) (S5 Fig), although the overall infectivity of AD17 TFV in these CD4 T cells was lower than that of the US-1 and 92/UG/029 strains (S5 Fig).