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Interferon Gamma and Interferon Gamma Inducible Protein-10 in Detecting Tuberculosis Infection

Overview
Journal J Infect
Date 2012 Mar 3
PMID 22381458
Citations 11
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Abstract

Objective: This study aimed to compare the levels of TB-antigen specific Interferon gamma (IFN-γ) and IFN-γ inducible protein (IP)-10 in culture of whole blood samples from healthy controls (HC) and healthy household contacts (HHC).

Methodology: A total of 386 study subjects, which included 186 HC and 200 HHC, were recruited. QuantiFERON-TB Gold in-tube (QFT-IT) assay was employed to measure IFN-γ levels. IP-10 levels were measured in the supernatants collected from QFT-IT tubes. Tuberculin skin test was also performed.

Results: The levels of TB antigen specific IFN-γ and IP-10 were significantly higher in HHC compared to HC. There was no significant difference observed between positivity of QFT-IT and IP-10 in HC and HHC. The positivity of TST was significantly lower in subjects <17 year, when compared to IP-10 (p<0.005). The reduced cut-off point 0.22IU/ml significantly increased the positivity of QFT-IT among children with high risk for latent TB infection (LTBI).

Conclusions: Measurement of TB antigen specific IFN-γ and IP-10 can be potential markers for the detection of LTBI.

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