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Characteristics distinguishing disseminated Mycobacterium tuberculosis (MTB) and non-tuberculous mycobacterial (NTM) infection in HIV patients

Purpose of the study

The characteristics that distinguish disseminated MTB and NTM infection in patients with advanced HIV disease remain poorly studied. We aim to describe clinical, laboratory and radiological features of MTB and NTM and identify discriminatory findings.

Methods

We conducted a retrospective case note review of all patients with culture-proven disseminated mycobacterial disease at a UK centre from 2005–2007. Patients with infection in ≥2 non-contiguous sites, or positive blood or bone marrow cultures, were included and stratified by causative pathogen. Categorical data were analysed by Fisher's exact test and non-categorical data by rank sum test.

Summary of results

Of the 64 patients with confirmed mycobacterial infection, 31 had disseminated disease (MTB:21, NTM:10 [nine due to M. avium Complex]). Of these, 81% were black African, 45% male, and median age was 34 years. Patients with NTM had lower CD4 T-cell counts, more prior or concurrent AIDS-defining illnesses, and were more frequently taking HAART at the time of mycobacterial diagnosis. Six NTM infections and one MTB infection appeared to be unmasked by HAART. Clinical features at presentation were non-discriminatory. On imaging, patients with MTB more often had parenchymal lung disease, whilst thoracic and abdominal lymphadenopathy was common in both groups. None of the patients with NTM had AFB smear positive respiratory specimens. Whereas the yield of blood cultures was low in patients with MTB, bone marrow specimens were diagnostic in all patients. Mortality was 8% for MTB and 30% for NTM cases. Immune reconstitution disease was observed in 52% of MTB and 30% of NTM patients. (Table 1.)

Table 1

Conclusion

Clinical and laboratory characteristics of patients with MTB and NTM overlap. In patients with suspected disseminated mycobacterial infection, prior or concurrent AIDS defining illnesses and recent HAART initiation favour NTM, while >100 CD4 T-cells/mm3 and parenchymal lung disease are suggestive of MTB.

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Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Bailey, A., Samarawickrama, A., Ibrahim, F. et al. Characteristics distinguishing disseminated Mycobacterium tuberculosis (MTB) and non-tuberculous mycobacterial (NTM) infection in HIV patients. JIAS 11, P262 (2008). https://doi.org/10.1186/1758-2652-11-S1-P262

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  • DOI: https://doi.org/10.1186/1758-2652-11-S1-P262

Keywords

  • Mycobacterial Infection
  • Bone Marrow Specimen
  • Case Note Review
  • Parenchymal Lung Disease
  • Retrospective Case Note Review