Evaluation of the Usefulness of Interferon-γ Release Assays and Tuberculin Skin Test for Detection of Latent Mycobacterium Tuberculosis Infection in Korean Patients With Rheumatic Diseases

Study Assessment The positive rates of QFT-G and TST as a screening test for LTBI The positive rates of QFT-G and TST will be analyzed Additional analysis will be performed according to the type of disease The agreement between QFT-G and TST as a screening test for LTBI The agreement between QFT-G and TST will be analyzed for patients with rheumatic diseases who examined both QFT-G and TST Additional analysis will be performed according to the type of disease The correlation of the occurrence of active TB and two tests (QFT-G and TST) The analysis of the correlation of the occurrence of active TB and two tests will be conducted for patients who have experienced anti-TNF agents 3-1. The occurrence of active TB in accordance with results of TST 3-2. The occurrence of active TB in accordance with results of QFT-G 3-3. The difference in the occurrence of active TB in patients performed both QFT-G and TST compared with those performed only TST for detecting of LTBI who are candidates of TNF inhibitors (pilot study).