FIG. 2.

Analysis of relative susceptibilities of recipient and nonrecipient PBMC to corresponding transmitter and nontransmitter HIV-1 variants. Virus variants isolated from transmitters and nontransmitters were titrated (expressed as TCID₅₀ per milliliter of supernatant) on PHA-stimulated PBMC from the respective recipients and nonrecipients and on PHA-stimulated PBMC from five healthy blood donors. Within each panel, the different symbols represent different virus variants derived from the specific transmitter or nontransmitter. The virus titers on PBMC from blood donors 1 and 3 (bd 1 + 3) and blood donors 2, 4, and 5 (bd 2,4+5) are shown as separate groups and are compared with the virus titers on PBMC from the respective nonrecipients (nr) and recipients (r) of couple D10 (a), couple C1 (b), couple D3 (c), and couple C4 (d). −, +, ++, and +++ indicate the relative susceptibilities of the recipient and nonrecipient PBMC.