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Infectious Disease20 papers

Primary tuberculous complex

Last edited: 4/10/2026

Overview

The primary tuberculous complex refers to the initial site of infection and the associated lymph node involvement in tuberculosis. It is a key concept in understanding the pathogenesis and initial presentation of tuberculosis, particularly in children.

Diagnosis

Low-complexity automated nucleic acid amplification tests (LC-aNAATs) are recommended for the simultaneous detection of Mycobacterium tuberculosis* complex and rifampicin resistance in non-respiratory specimens for extrapulmonary tuberculosis 1.
  • Xpert MTB/RIF is recommended in place of smear microscopy for diagnosing tuberculosis 2.
  • Management

  • No management information is available in the provided abstracts.
  • Special Populations

  • LC-aNAATs are applicable to adults and adolescents with presumptive extrapulmonary tuberculosis 1.
  • No specific information is available for pregnant individuals, the elderly, or those with comorbidities.
  • Key Recommendations

  • Low-complexity automated nucleic acid amplification tests (LC-aNAATs) are recommended for diagnosing extrapulmonary tuberculosis and rifampicin resistance in adults and adolescents using non-respiratory specimens 1. (Evidence: Moderate)
  • Xpert MTB/RIF is recommended as a replacement for smear microscopy in the diagnosis of tuberculosis 2. (Evidence: Moderate)
  • References

    1 Kohli M, Inbaraj LR, Salomon A, Scandrett K, Korobitsyn A, Ismail N et al.. Low-complexity automated nucleic acid amplification tests for extrapulmonary tuberculosis and rifampicin resistance in adults and adolescents. The Cochrane database of systematic reviews 2025. link 2 Haraka F, Kakolwa M, Schumacher SG, Nathavitharana RR, Denkinger CM, Gagneux S et al.. Impact of the diagnostic test Xpert MTB/RIF on patient outcomes for tuberculosis. The Cochrane database of systematic reviews 2021. link

    Original source

    1. [1]
      Low-complexity automated nucleic acid amplification tests for extrapulmonary tuberculosis and rifampicin resistance in adults and adolescents.Kohli M, Inbaraj LR, Salomon A, Scandrett K, Korobitsyn A, Ismail N et al. The Cochrane database of systematic reviews (2025)
    2. [2]
      Impact of the diagnostic test Xpert MTB/RIF on patient outcomes for tuberculosis.Haraka F, Kakolwa M, Schumacher SG, Nathavitharana RR, Denkinger CM, Gagneux S et al. The Cochrane database of systematic reviews (2021)

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