Tuberculin skin test – Outdated or still useful for Latent TB infection screening?

Gina Gualano, Paola Mencarini, Francesco Nicola Lauria, Fabrizio Palmieri, Sayoki Mfinanga, Peter Mwaba, Jeremiah Chakaya, Alimuddin Zumla, Giuseppe Ippolito

Research output: Contribution to journalArticle

Abstract

Objective: To make an informed viewpoint on the usefulness of Tuberculin Skin test (TST) compared to Interferon Gamma Release Assays (IGRAs) for diagnosis of Latent TB Infection (LTBI) in different geographical settings. Methods: We reviewed the current literature on TST compared to IGRA, including national implementation of WHO LTBI recommendations and retrospective data over the past 7 years at the National Institute for Infectious Diseases “L. Spallanzani” as indirect indicator of usage of both tests under actual programmatic conditions. Results: Current national guidelines vary considerably, reflecting the uncertainty and rapidly evolving evidence about the potential use of these tests. Data from Institute “L. Spallanzani” showed IGRA concordance in TST positive subjects only in 54.74% of subjects, while there was strong concordance between two tests in TST negative subjects (93.78%). Conclusion: Neither IGRAs nor TST can distinguish active TB from LTBI. TST will continue to be clinically useful in low and high TB endemic areas until more accurate and predictive tests will become available. Clinical judgment remains fundamental in choosing between IGRA/TST tests and interpreting their results.

Original languageEnglish
Pages (from-to)S20-S22
Number of pages3
JournalInternational Journal of Infectious Diseases
Volume80
DOIs
Publication statusPublished - Mar 1 2019

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Keywords

  • IGRA
  • Interferon-γ release assays
  • Latent TB
  • LTBI
  • Quantiferon
  • TB
  • TST
  • Tuberculin skin test
  • Tuberculosis

ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases

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