Fig. 1. Flow chart of enrolled participants. The study included healthy adults aged >20 years with normal chest radiography results and no history of tuberculosis (TB). Among participants with known TB exposure, 13 are QuantiFERON-TB Gold In-Tube assay (QFT-GIT)-positive and identified as having latent TB infection (LTBI). Conversely, 12 participants without known TB exposure are QFT-negative and considered as healthy controls (HCs).
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