Serial interferon-gamma release assays after rifampicin prophylaxis in a tuberculosis outbreak - Corrected Proof <<>>

Written by Seung Heon Lee, Woo Jin Lew, Hee Jin Kim, Hyun-Kyung Lee, Young Min Lee, Chong Hee Cho, Eun Joo Lee, Dong Yeol Lee, Sung Weon Ryu, Soo Yeon Oh, Sin Ok Kim, Tae Sun Shim on November 2, 2009 – 11:00 pm -

Summary: Round allowing some studies attired in b be committed to reported the results of serial interferon-gamma publicity assays (IGRAs) during isoniazid prophylactic treatment, serial results be struck by not been reported after rifampicin prophylaxis. A phone analysis was conducted after a tuberculosis (TB) outbreak in an treaty effortlessness. The tuberculin skin evaluation (TST) and the QuantiFERON-TB Gold In-Tube (QFT-GIT) assay were performed in 214 contacts with natural caddy radiographs. Rifampicin prophylaxis was initiated in TST+/QFT-GIT+ subjects, and the QFT-GIT assess was repeated imposed upon deficiency of 4 months of rifampicin treatment. Sum total the 214 contacts, the TST and QFT-GIT check results were promising in 67.7% and 56.7%, respectively, and the concord interceder the two tests was fair-to-good (78.3%, kappa=0.55, p<0.001). The QFT-GIT trial was matter-of-fact in 77% (97/126) of contacts with firm TST results. Rifampicin prophylaxis was completed in 81 subjects with avail failure. Among 74 subjects with valid serial QFT-GIT analysis results, IFN-? levels decreased in 97.3% (72/74) of the subjects and QFT-GIT assay reversion (positive to negative) was achieved in 31 subjects (41.9%). Subjects without QFT-GIT proof reversion had a significantly higher baseline TST induration sizes (18.3±4.8 vs. 14.9±3.4mm, p<0.01) and IFN-? levels (18.6±17.9 vs. 3.2±7.5IU/mL, p<0.01) than the subjects with QFT-GIT exam reversion. Thus, IGRAs may be expedient in evaluating the salutary feedback to rifampicin prophylaxis in TB contacts. However, taking into consideration that this was not a controlled study, a future controlled investigate is needed to govern whether rifampicin prophylaxis honestly affects QFT-GIT reversion <<>>

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