The patients with poorly controlled DM underwent LTBI screening by using QuantiFERON (QFT). QFT-positivity predictors were evaluated. The patients with LTBI received tuberculosis preventive therapy, 9 months of daily isoniazid (9H) or 3 months of weekly rifapentine plus isoniazid (3HP), administered by pulmonologists. The completion rates and inflammatory markers were also investigated.