Limited value of whole blood Xpert(®) MTB/RIF for diagnosing tuberculosis in children

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Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test
08:10

Diagnosing Pulmonary Tuberculosis with the Xpert MTB/RIF Test

Published on: April 9, 2012

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Christian Pohl1, Liliana K Rutaihwa1, Frederick Haraka2

  • 1Swiss Tropical and Public Health Institute, Basel, Switzerland; University of Basel, Basel, Switzerland; Ifakara Health Institute, Bagamoyo, Tanzania.

The Journal of Infection
|July 11, 2016
PubMed

Insights

The Xpert MTB/RIF assay showed very low sensitivity for detecting Mycobacterium tuberculosis in children's whole blood. While not ideal for general diagnosis, it may aid in identifying select cases of culture-negative tuberculosis.

Area of Science:

  • Medical Diagnostics
  • Infectious Diseases
  • Pediatrics

Background:

  • Tuberculosis remains a significant global health challenge, particularly in high-HIV settings.
  • Accurate and rapid diagnostics are crucial for effective tuberculosis management in children.
  • The Xpert MTB/RIF assay is a molecular test for Mycobacterium tuberculosis detection.

Purpose of the Study:

  • To evaluate the diagnostic performance of the Xpert MTB/RIF assay using whole blood samples.
  • To assess the assay's ability to detect Mycobacterium tuberculosis in children in tuberculosis-endemic regions with high HIV prevalence.

Main Methods:

  • Prospective enrollment of 232 children with suspected tuberculosis in Tanzania and Uganda.
  • Collection of respiratory specimens for microscopy and culture, and whole blood for Xpert MTB/RIF testing.
  • Classification of children based on standardized case definitions and composite reference standards.

Main Results:

  • The Xpert MTB/RIF assay detected Mycobacterium tuberculosis in 2.2% of whole blood samples.
  • Sensitivity against culture-confirmed tuberculosis was 7.1% (95% CI, 1.3-31.5).
  • Sensitivity against a composite reference standard (including probable cases) was 5.4% (95% CI, 2.1-13.1).

Conclusions:

  • Whole blood Xpert MTB/RIF demonstrated very poor sensitivity for diagnosing childhood tuberculosis.
  • The assay may offer a limited diagnostic advantage in specific cases of culture-negative tuberculosis.
  • Further research is needed to optimize diagnostic strategies for pediatric tuberculosis.
Abstract

Keywords:
ChildhoodDiagnosisTuberculosisWhole bloodXpert MTB/RIF

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