BACKGROUND: Currently, there is no available test for monitoring the clinical effect of active tuberculosis (TB) disease treatment. Therefore, we studied the usefulness of two commercial IFN-gamma assays (QuantiFERON TB-2G (QFT-2G) and T-SPOT.TB tests) for monitoring clinical efficacy. METHODS: The subjects were 40 patients with active TB disease. These two commercial IFN-gamma assays were carried out every three months during active TB disease treatment. RESULTS: While the positive response rate of QFT-2G test significantly decreased from 83% at treatment initiation to 58% at treatment completion, that of T-SPOT.TB decreased from 90% at treatment initiation to 63% at treatment completion. Although there was a significant decrease in patients with TB infection showing positive responses for ESAT-6 only or CFP-10 only antigens on both IFN-gamma assays, there was no significant decrease in patients showing positive responses for both ESAT-6 and CFP-10 antigens on both IFN-gamma assays. On both QFT-2G test and T-SPOT.TB test, the mean values of the IFN-gamma levels in the pre- and post-treatment responses showed significantly decreased responses to CFP-10. On the other hand, smear conversion results of clinical specimens were obtained in all patients at treatment completion. CONCLUSIONS: Antituberculous treatment induced a significant decrease in T-cell responses to separate ESAT-6 and CFP-10 antigens as measured by both IFN-gamma assays. Although IFN-gamma assays might be later than smear conversion results of clinical specimens, the quantitative responses especially to CFP-10 may be one of the useful monitoring markers of clinical efficacy for active TB disease treatment.
BACKGROUND: Currently, there is no available test for monitoring the clinical effect of active tuberculosis (TB) disease treatment. Therefore, we studied the usefulness of two commercial IFN-gamma assays (QuantiFERON TB-2G (QFT-2G) and T-SPOT.TB tests) for monitoring clinical efficacy. METHODS: The subjects were 40 patients with active TB disease. These two commercial IFN-gamma assays were carried out every three months during active TB disease treatment. RESULTS: While the positive response rate of QFT-2G test significantly decreased from 83% at treatment initiation to 58% at treatment completion, that of T-SPOT.TB decreased from 90% at treatment initiation to 63% at treatment completion. Although there was a significant decrease in patients with TB infection showing positive responses for ESAT-6 only or CFP-10 only antigens on both IFN-gamma assays, there was no significant decrease in patients showing positive responses for both ESAT-6 and CFP-10 antigens on both IFN-gamma assays. On both QFT-2G test and T-SPOT.TB test, the mean values of the IFN-gamma levels in the pre- and post-treatment responses showed significantly decreased responses to CFP-10. On the other hand, smear conversion results of clinical specimens were obtained in all patients at treatment completion. CONCLUSIONS: Antituberculous treatment induced a significant decrease in T-cell responses to separate ESAT-6 and CFP-10 antigens as measured by both IFN-gamma assays. Although IFN-gamma assays might be later than smear conversion results of clinical specimens, the quantitative responses especially to CFP-10 may be one of the useful monitoring markers of clinical efficacy for active TB disease treatment.
Authors: Tom G Connell; Mary-Ann Davies; Christine Johannisen; Kathryn Wood; Sandy Pienaar; Katalin A Wilkinson; Robert J Wilkinson; Heather J Zar; David Beatty; Mark P Nicol; Nigel Curtis; Brian Eley Journal: BMC Infect Dis Date: 2010-05-27 Impact factor: 3.090
Authors: Ifedayo M O Adetifa; Martin O C Ota; Brigitte Walther; Abdulrahman S Hammond; Moses D Lugos; David J Jeffries; Simon A Donkor; Richard A Adegbola; Philip C Hill Journal: PLoS One Date: 2010-09-01 Impact factor: 3.240
Authors: Ki-Ho Park; Mi Suk Lee; Sang-Oh Lee; Sang-Ho Choi; Yang Soo Kim; Jun Hee Woo; Joong Koo Kang; Sang-Ahm Lee; Sung-Han Kim Journal: Korean J Intern Med Date: 2014-10-31 Impact factor: 2.884