Mycobacterium colombiense isolation among people living with human immunodeficiency virus: a case series.

Authors

Manuel Paz-Infanzon, Karla Paola Cuellar-Calderón, Samantha Flores-Treviño, Joel Isaí Alcala-González, María Teresa Ramírez-Elizondo, Adrián Camacho-Ortiz

Published in

Future microbiology. Pages 1-6. Jun 24, 2026. Epub Jun 24, 2026.

Abstract

Mycobacterium colombiense is a seldom reported non-tuberculous mycobacteria causing infections mostly in immunosuppressed patients. Thus, we present the findings of three M. colombiense isolation cases from a third-level hospital in Monterrey, Mexico, during 2020-2024. Mycobacterial identification was performed using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and Anyplex™ MTB/NTM Real-time Detection. Patients were people living with Human Immunodeficiency Virus (PLHIV), with pneumonia and lymphadenopathy. Patients had high HIV viral loads and low CD4 counts (21-103 cells/mm³). None of the cases had specific Mycobacterium avium complex (MAC) treatment, and all of them showed clinical improvement. Current non-tuberculous mycobacteria discrimination tests may not effectively diagnose significant pathogens like M. colombiense, potentially leading to delays in treatment and negatively impacting patient outcomes.

PMID:
42339508
Bibliographic data and abstract were imported from PubMed on 24 Jun 2026.

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