Diagnostic benefits of adding EspC, EspF and Rv2348-B to the QuantiFERON Gold In-tube antigen combination.

Abstract:

:Interferon (IFN)-γ release assays (IGRAs) are used to diagnose latent tuberculosis (TB) infection (LTBI). To improve the accuracy of these tests, different approaches, such as alternative cytokine detection and using different antigens, are considered. Following this purpose, this study aims to evaluate the addition of EspC, EspF and Rv2348-B to those present in the QuantiFERON-TB Gold In-Tube (QFN-G-IT). We included 115 subjects: 74 active TB patients, 17 LTBI individuals and 24 healthy controls. Whole blood samples were collected in QFN-G-IT and in-house tubes containing different combinations of EspC, EspF and Rv2348-B, together with ESAT-6, CFP-10, and TB7.7. After overnight incubation at 37 ºC, plasma was harvested and IFN-γ quantified. IFN-γ levels in the QFN-G-IT and in-house tubes correlated very good (Spearman Rho(r) > 0.86). In-house antigen combinations distinguished healthy individuals from those with active TB and LTBI (specificities and sensitivities higher than 87.5% and 96.3%, respectively [AUC > 0.938]). Adding EspC, EspF and Rv2348-B, increased the sensitivity of the test, being the addition of EspC and Rv2348-B the combination that yielded a higher sensitivity with no specificity loss. Addition of these antigens could improve diagnosis in patients with impaired or immature immune response who are at high risk of developing TB.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Villar-Hernández R,Blauenfeldt T,García-García E,Muriel-Moreno B,De Souza-Galvão ML,Millet JP,Sabriá F,Sánchez-Montalvá A,Ruiz-Manzano J,Pilarte J,Jiménez MA,Centeno C,Martos C,Molina-Pinargote I,González-Díaz YD,Santiago J

doi

10.1038/s41598-020-70204-w

subject

Has Abstract

pub_date

2020-08-06 00:00:00

pages

13234

issue

1

issn

2045-2322

pii

10.1038/s41598-020-70204-w

journal_volume

10

pub_type

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