Frequency of Tax11-19/HLA-A*0201 or Tax301-309/HLA-A*0201 tetramer binding CD8+ T cells in ACs, HAM/TSP patients and CCs. The percentage of tetramer+ cells in CD8+ lymphocytes in ACs, HAM/TSP patients and CCs. Horizontal bars indicate the mean percentage of tetramer positive cells. The numbers below each subject indicate mean±S.D. *P<0.001; **P<0.05 (Significant differences by Mann-Whitney U test).