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Clinical Significance of Interferon $\gamma$ Release Assay for Diagnosis of Tuberculosis in Children  

Lee, Hee Woo (Department of Pediatrics, Eulji General Hospital, College of Medicine, Eulji University)
Park, Hwa Young (Department of Pediatrics, Eulji General Hospital, College of Medicine, Eulji University)
Ahn, Young Min (Department of Pediatrics, Eulji General Hospital, College of Medicine, Eulji University)
Sohn, Keun Chan (Department of Pediatrics, Eulji General Hospital, College of Medicine, Eulji University)
Publication Information
Pediatric Infection and Vaccine / v.17, no.2, 2010 , pp. 137-147 More about this Journal
Abstract
Purpose : The purpose of this study is to evaluate the usefulness and limitation of QuantiFERON-TB Gold (QTB) for diagnosis of latent tuberculosis in children. Methods : The medical records of 112 children who were tested by tuberculin skin test (TST) and QTB for detection of latent tuberculosis (TB) in Eulji General Hospital during the period from January 2007 to June 2009 were retrospectively reviewed. Results : Of the 112 participants, the clinical TB group included 15 (13.4%), the contact group included 43 (38.4%), and the non-contact group included 54 (48.2%). Positive rates of TST and QTB were 100% and 80% in the clinical TB group, 64% and 14% in the close contact group, 27% and 0% in the casual contact group, and 52% and 2% in the non-contact group, respectively. Sensitivity of QTB was 80.0% and specificity was 92.6%. Agreement between QTB and TST was poor ($\kappa$=0.209). We also confirmed that the positive rate of QTB increased as the age of the patient increased (P=0.011). A QTB indeterminate result was observed in 11 (9.8%) subjects. QTB was retested in 15 subjects. In 5 of the 6 subjects who had positive results initially, positive results persisted for a median 2.2 months after termination of treatment. Conclusion : Although QTB was associated with several problems, including low sensitivity and a high rate of indeterminate results, it had clinical importance due to its high specificity. We found good correlation with regard to exposure and QTB positivity, including that of young children under 5 years of age. However, clinical application of interferon-$\gamma$ releasing assay for young children for diagnosis of active and latent tuberculosis will require additional prospective studies.
Keywords
Tuberculosis; Tuberculin skin test; Interferon $\gamma$ release assay; QuantiFERON-TB Gold assay; Children;
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