This study aimed to estimate the risk of progression to active tuberculosis (TB) within 2 yrs after entry in newly arriving immigrants who were screened with the QuantiFERON®-TB Gold In-Tube assay (QFT-GIT; Cellestis, Carnegie, Australia).
In a case–base design, we determined the prevalence QFT-GIT-positive subjects among a representative sample of immigrants aged ≥18 yrs who arrived between April 2009 and March 2011 (the base cohort). Active TB patients (cases) within 2 yrs post-arrival in 2005, 2006 or 2007 were extracted from the Netherlands Tuberculosis Register. The risk of progression to active TB was estimated using Bayesian analyses to adjust for the sensitivity of QFT-GIT.
Among the base cohort, 20% of 1,468 immigrants were QFT-GIT positive. Stratified by TB incidence in the person's country of origin as low (<100 cases per 100,000 population), intermediate (100–199 cases per 100,000) or high (≥200 cases per 100,000), the risk of progression to active TB per 100,000 arriving immigrants if QFT-GIT positive (95% credibility interval) was 456 (95% CI 307–589), 590 (397–762) and 386 (259–499), respectively, compared with 18 (0–46), 38 (0–97) and 28 (0–71) if QFT-GIT negative.
Screening newly arriving immigrants with QFT-GIT contributes to detecting those at high risk of subsequent TB reactivation within 2 yrs after entry, which offers opportunities for prevention by targeted interventions.
This article has supplementary material available from www.erj.ersjournals.com
This work and its open access publication were supported by the Netherlands Organization for Health Research and Development (ZonMw, grant number 125010011).
Statement of Interest
This article was modified in April 2016 to correct errors in the licence information.
- Received January 17, 2012.
- Accepted March 7, 2012.
- Copyright © ERS 2012
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