In total, 90 participants (63 women and 27 men) were categorized into four groups based on TST results, history of tuberculosis, and HTLV-1 infection status: HTLV-1-infected individuals with a history of tuberculosis (HTLV/TB; n = 16), HTLV-1-infected individuals with a positive TST (HTLV/TST+; n = 25), HTLV-1-infected individuals with a negative TST (HTLV/TST-; n = 25), and HNs with a positive TST (HNs/TST+; n = 24). Here, TST is linked to tuberculosis.