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Antibody reactivity to various secretory antigens of M. tuberculosis with sera derived from different clinical groups (FTB: fresh untreated, DTB: defaulters, RTB: relapsed, EPTB: extra-pulmonary TB) of tuberculosis patients and controls (HC: healthy controls, LP: leprosy patients). TtTB denotes the treated cases of tuberculosis. Each scatter represents a tested sample of serum, the dotted line denotes the cutoff decided by ROC
