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Effect of Tuberculin Skin Test on Ex-vivo Interferon-gamma Assay for Latent Tuberculosis Infection  

Lee, Jung Yeon (Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center)
Choi, Hee Jin (University of Ulsan College of Medicine, Asan Medical Center, Asan Institute for Life Sciences)
Cho, Sang-Nae (Department of Microbiology, Yonsei University College of Medicine)
Park, I-Nae (Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center)
Oh, Yeon-Mok (Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center)
Lee, Sang Do (Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center)
Kim, Woo Sung (Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center)
Kim, Dong Soon (Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center)
Kim, Won Dong (Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center)
Shim, Tae Sun (Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Asan Medical Center)
Publication Information
Tuberculosis and Respiratory Diseases / v.59, no.4, 2005 , pp. 406-412 More about this Journal
Abstract
Background : Recently, two commercialized whole-blood assays, $QuantiFERON^{(R)}-TB$ Gold (QFT) and T $SPOT-TB^{(R)}$ (SPOT), which measure the $IFN-{\gamma}$ released in the whole blood after being incubation with mycobacterial antigens, were approved for the diagnosis of a latent tuberculosis infection (LTBI). However, there is data on whether or not the previously used PPD skin tests (TST) have any influence on the diagnostic ability of these ex-vivo $IFN-{\gamma}$ assays. Methods : Forty-six 15 year-old students who did not appear to be infected with Mycobacterium tuberculosis were enrolled in this study. The peripheral blood was collected and used for two $IFN-{\gamma}$ assays. The $IFN-{\gamma}$ assays and TST were performed at the baseline ($1^{st}$). The TST was repeated two months later ($2^{nd}$), and the $IFN-{\gamma}$ assays were repeated two ($2^{nd}$) and four months ($3^{rd}$) later only in those subjects who had negative results at the baseline in both the $IFN-{\gamma}$ assays and TST. An induration size > 10 mm was considered to be positive in the TST. Results : The mean TST value was $3.1{\pm}5.4mm$ (range: 0-20). Of the 46 subjects examined, 13 subjects (28.3%) showed positive results in the two-step TST. Nine (19.6%) were SPOT-positive and only one (2.2%) was QFT-positive. The $2^{nd}$ and $3^{rd}$ QFT were carried out in 23 and 25 all-negative subjects, respectively, and all showed negative results. The $2^{nd}$ SPOT was performed in 23 subjects and only one (4.3%) showed a weak-positive result. Conclusion : Even though there were some discrepancies in the results of the two ex-vivo $IFN-{\gamma}$ assays, it appears that their results were not influenced by a previous TST carried out in two or four months earlier.
Keywords
Latent tuberculosis infection; Interferon-gamma assay; Tuberculin skin test; Purified Protein Derivative;
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