Percentages of HTLV-1–infected CD4⁺ and CD8⁺ T cells expressing Tax in 4 HAM/TSP patients.

Percentages were calculated using the proviral load of CD4⁺and CD8⁺ isolates and maximum Tax expression observed in each T-cell type. Percentages of infected cells expressing Tax were calculated as follows: (number of CD4⁺ or CD8⁺cells expressing Tax/total number of CD4⁺ or CD8⁺ cells in PBMC culture)/(proviral load in purified CD4⁺ or CD8⁺ T cells). Striped bars represent percentages obtained for CD4⁺ T cells, and black bars represent proportions obtained for CD8⁺ T cells.