Infectious HIV-1 harbored by TERT-2 cells. TERT-2 monolayers were incubated for 6 h with HIV-1 (IIIb or BaL). TERT-2 cells were then trypsinized, washed, and maintained in growth media. At the indicated time post inoculation, TERT-2 cells were co-cultured with (A) PHA-activated PBMCs to test for direct transfer of HIV-1. To learn if infectious HIV-1 is released from TERT-2 cells, (B) spent media were recovered and used to inoculate PHA-activated PBMCs. After exposure to TERT-2 cells or media, PBMC supernatants were harvested at day 9 and analyzed for p24gag production by ELISA. Data shown are the mean ± standard deviation from three independent experiments, each performed in triplicate.