CD4 and infection: Similar results were obtained with CD4+ T-cells, where median HIV-1 gag-p24 antigen release in their supernatants at 7 days post infection (compared to HIV-1BaL) was 62.9% (50,831 pg/ml; IQR: 10,146–92,302 pg/ml; 12 isolates tested) (data not shown).