Abstract: Objective To reexplore the clinical value and influencing factors of serum tuberculosis antibody(TB-Ab) IgG in the first-treated patients with smear-positive pulmonary tuberculosis(TB). Methods The positive rate of serum TB-Ab-IgG in 1 911 first-treated patients with smear-positive TB were analyzed retrospectively and were compared with healthy people of in the same period.The relationships between positive rate of serum TB-Ab-IgG and some clinical features including the size of lesion,cavity wi...