Purpose: Macrolide susceptibility differs between subspecies in the Mycobacterium abscessus complex, likely due to differences in erm(41) sequevars. Patients with M. abscessus complex infection generally show poor clinical outcomes in response to antibiotic treatment. Here, the association between genotype and treatment outcome was investigated.
Methodology: We collected 69 isolates from 35 patients with non-cystic fibrosis bronchiectasis: 24 had M. abscessus complex lung disease and non-cystic fibrosis bronchiectasis, and 11 were colonized. Outcome analysis was performed in the 24 infected patients. Molecular analyses, including erm(41) and rrl sequencing, and variable-number tandem-repeat (VNTR) analysis of 69 isolates, from 24 infected and 11 colonized patients, were performed to elucidate the influence of genotype on antibiotic susceptibility.
Results: Among the 24 patients, 18 (14 infected with M. abscessus subsp. abscessus and 4 with M. abscessus subsp. massiliense) showed unfavourable outcomes; six (three infected with M. abscessus subsp. abscessus and three with M. abscessus subsp. massiliense) exhibited favourable outcomes. Patients with unfavourable outcomes showed acquired clarithromycin resistance (33.3 vs 0 %), mixed sequevars (38.9 vs 16.7 %) and differing VNTR patterns between initial and serial isolates (33.3 vs 16.7 %). In contrast, in the 11 colonized patients, M. abscessus subsp. abscessus C28 (sequevar 02) and M. abscessus subsp. massiliense were the most prevalent subspecies.
Conclusion: Patients infected with multiple sequevars and genotypes were more likely to exhibit treatment failure and/or recurrence. The precise identification of subspecies and analyses of mycobacterial characteristics may help to predict treatment outcomes in patients with M. abscessus complex lung disease.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1099/jmm.0.000661 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
In vitro activity of omadacycline against geographically diverse rapidly growing nontuberculous mycobacteria (NTM) clinical isolates.
Diagn Microbiol Infect Dis
December 2024
Department of Medical Microbiology, Radboudumc Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, The Netherlands.
Nontuberculous mycobacteria (NTM) are emerging opportunistic pathogens with limited treatment options due to resistance to multiple antibiotic classes. This study aimed to evaluate the in vitro activity of omadacycline and comparator antibiotics against rapidly growing mycobacteria (RGM) clinical isolates. Minimum inhibitory concentration (MIC) evaluation of RGM clinical isolates was performed by two independent laboratories (EU and Japan).
View Article and Find Full Text PDFTransposon-sequencing across multiple isolates reveals significant functional genomic diversity among strains.
mBio
December 2024
Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA.
Unlabelled: ) is a clinically significant pathogen and a highly genetically diverse species due to its large accessory genome. The functional consequence of this diversity remains unknown mainly because, to date, functional genomic studies in have been primarily performed on reference strains. Given the growing public health threat of infections, understanding the functional genomic differences among clinical isolates can provide more insight into how its genetic diversity influences gene essentiality, clinically relevant phenotypes, and importantly, potential drug targets.
View Article and Find Full Text PDFIncidence of mycobacteria in pulmonary granulomatous lesions.
Clinics (Sao Paulo)
December 2024
Hospital Sírio Libanês, São Paulo, SP, Brazil.
Mycobacteria infections are caused by species of the Mycobacterium tuberculosis complex (MTB) and other species called Non-Tuberculosis Mycobacteria (NTM). Identification of mycobacteria species is very important to define treatment and it can be achieved by direct culture. However, the lack of clear protocols regarding the use of culture or molecular tests on specimens diagnosed with granulomatous lesions causes delays in the diagnosis of the etiological agents and, consequently, the definition of the right treatment.
View Article and Find Full Text PDFGenomic analysis of global Mycobacterium abscessus isolates reveals ongoing evolution of drug-resistance-associated genes.
J Infect Dis
November 2024
Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
Mycobacterium abscessus (MAB) is intrinsically resistant to many antibiotics, but the evolution of acquired drug resistance is poorly understood. We analyzed published genomes of 5,617 clinical MAB isolates from 20 countries and searched for signals of ongoing evolution in 35 drug-resistance-associated genes. Of these, we found 14 genes were subject to positive selection and identified novel mutational sites under selection.
View Article and Find Full Text PDFManaging Complicated Nontuberculous Mycobacteria Infections in Plastic Surgery.
Plast Reconstr Surg Glob Open
October 2024
From the Department of Plastic, Reconstructive, Aesthetic, and Maxillofacial Surgery. Hospital Vargas de Caracas, San José, Caracas, Venezuela.
Nontuberculous mycobacteria (NTM) infections after cosmetic surgery have become an increasing concern. These infections are often initially misdiagnosed and treated with standard antibiotic regimens, which fail to resolve the underlying infection, leading to prolonged patient suffering. In this case study, we describe a chronic wound infection caused by subsp.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!