Copyright: © 2025 by the authors. Licensee: Pirogov University.
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ORIGINAL RESEARCH

Susceptibility of the nontuberculous mycobacteria circulating in Russia to bedaquiline

About authors

1 Central Tuberculosis Research Institute, Moscow, Russia

2 Russian University of Medicine, Moscow, Russia

Correspondence should be addressed: Tatiana G. Smirnova
Yauzskaya alleya, 2, str. 1А, Moscow, 107564, Russia; ur.liam@aktat_s

About paper

Funding: the study was conducted under the State Assignment of the Central Tuberculosis Research Institute, R&D project: 123061500080-6 “Developing an Import-Independent Technology to Determine Minimal Inhibitory Concentrations of Antibacterial Drugs Effective Against the Clinically Significant Nontuberculous Mycobacterial Species”

Author contribution: Chernousova LN, Ergeshov AЕ — study design; Ustinova VV, Kiseleva EA — experimental procedure; Smirnova TG — data analysis, manuscript writing; Larionova EE — data analysis; Zaytseva AS — literature review, manuscript draft writing; Andreevskaya SN — data analysis; all authors contributed to the discussion.

Compliance with ethical standards: the study was conducted in accordance with the principles of the Declaration of Helsinki (1964) and its further revisions.

Received: 2025-10-02 Accepted: 2025-10-18 Published online: 2025-10-30
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The diseases caused by nontuberculous mycobacteria (NTM) are a public health problem all over the world due to increasing incidence and the associated mortality. Since it is difficult to treat mycobacteriosis, the search for drugs effective against NTM is relevant. Bedaquiline was approved in 2012 as a drug for tuberculosis treatment. The study aimed to determine susceptibility to bedaquiline of the main clinically significant NTM species that were common in the Russian Federation. In 2011–2024, a total of 345 NTM isolates were obtained: 289 isolates of slow growing NTM species (M. avium, M. intracellulare, M. chimaera, M. kansasii, M. xenopi) and 56 of the fast growing one (M. abscessus). Drug susceptibility testing for bedaquiline was performed by microdilution in a 96-well plate using the bedaquiline concentration range of 0.125–4 µg/mL. The minimum inhibitory concentration of bedaquiline inhibiting 50% (MIC50) and 90% (MIC90) of NTM strains of each spesies was determined. It has been shown that the bedaquiline MIC50 for M. avium, M. intracellulare, M. chimaera, M. kansasii is < 0.125 µg/mL, MIC90 — from < 0.125 to 0.5 µg/mL, for M. xenopi: MIC50 —4 µg/mL, MIC90 — > 4 µg/mL, M. abscessus: MIC50 — 1 µg/mL, MIC90 — 2 µg/mL.

Keywords: drug susceptibility, non-tuberculous mycobacteria, anti-tuberculosis drugs, bedaquiline, minimal inhibitory concentration

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