The kinetics of the HTLV-1 proviral load after RIST by different types of donors. Panel B indicates transplants from HTLV-1^- donors; panel A shows results from HTLV-1⁺ carrier donors. The HTLV-1 proviral load was expressed as copies per 1000 MNCs. A load of less than 0.5 copies/1000 MNCs was considered to be undetectable. ○ indicates patients still alive at end of study; •, patients that died during study. BR indicates before RIST. The horizontal line at 0.5 indicates detection limit. PBMNC indicates peripheral blood mononuclear cell.