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Variability of Mycobacterium avium Complex Isolates Drug Susceptibility Testing by Broth Microdilution.

Authors :
Zimenkov, Danila
Source :
Antibiotics (2079-6382); Dec2022, Vol. 11 Issue 12, p1756, 18p
Publication Year :
2022

Abstract

Non-tuberculous mycobacteria are widely distributed in environments and are capable of infecting humans, particularly those with a compromised immune system. The most prevalent species that cause nontuberculous mycobacterial lung diseases are slow-growing bacteria from the Mycobacterium avium complex (MAC), mainly M. avium or M. intracellulare. The key treatment of MAC infections includes macrolides, ethambutol, and rifampicin; however, the therapy outcomes are unsatisfactory. Phenotypic drug susceptibility testing is a conditional recommendation prior to treatment, and critical concentrations for clarithromycin, amikacin, moxifloxacin, and linezolid have been established. In this review, data from studies on the determination of MIC of clinical isolates using the broth microdilution method were summarized. A significant variation in the MIC distributions from different studies was found. The main reasons could impact the findings: insufficient reproducibility of the phenotypic testing and variation in species lineages identified in different laboratories, which could have various intrinsic susceptibility to drugs. For most of the drugs analyzed, the MICs are too high, which could undermine the treatment efficiency. Further improvement of treatment outcomes demands the validation of microbiological resistance criteria together with the identification of molecular mechanisms of resistance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20796382
Volume :
11
Issue :
12
Database :
Complementary Index
Journal :
Antibiotics (2079-6382)
Publication Type :
Academic Journal
Accession number :
160943109
Full Text :
https://doi.org/10.3390/antibiotics11121756