1921
Volume 100, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

Abstract.

Interferon-gamma release assays are increasingly used in children to establish evidence of tuberculosis (TB) infection and to assist in the diagnosis of TB disease. The QuantiFERON-TB Gold In-Tube assay is being phased out in favor of a next-generation test, the QuantiFERON-TB Gold Plus (QFT-Plus) assay. The QFT-Plus assay is designed with two antigen tubes to differentially stimulate CD4 and CD8 T cells. The performance of this assay has been documented extensively in adults but has not yet been evaluated in children. Here, we compare the performance of the two assays in a cohort of 46 children exposed to TB and 12 children diagnosed with TB disease in Eswatini. The tests demonstrated excellent concordance in both TB disease (100% agreement, Cohen’s kappa = 1) and TB infection (96% agreement, Cohen’s kappa = 0.91). Most of the children with household exposure tested negative for TB infection by both tests, indicating the ongoing need for new tests for TB infection that can be easily implemented in TB high-burden settings at minimal cost.

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  • Received : 16 Aug 2018
  • Accepted : 27 Nov 2018
  • Published online : 21 Jan 2019
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