Colistin Resistance Profiles, Molecular Investigation of mcr-1 and mcr-2 Plasmid Genes and Investigation of Carbapenemase Production in Pseudomonas and Acinetobacter Strains  

作　　者：Jean Fabrice Yala Hilaire Kenguele Moundounga Rolande Mabika Mabika Franck Mounioko Ornella Zong Minko Sougouna Henda Rokyatou Bikieya Massima Alain Souza Jean Fabrice Yala;Hilaire Kenguele Moundounga;Rolande Mabika Mabika;Franck Mounioko;Ornella Zong Minko;Sougouna Henda;Rokyatou Bikieya Massima;Alain Souza(Laboratoire de Biologie Moléculaire et Cellulaire, Equipe de Microbiologie (LABMC), Unité de Recherche Agrobiologie, Université des Sciences et Techniques de Masuku (USTM), Franceville, Gabon;Laboratoire de Bactériologie, Unité de Recherche d’Analyses Médicales (URAM), Centre Interdisciplinaire de Recherches Médicales de Franceville (CIRMF), Franceville, Gabon;Unité d’Ecologie des Systèmes Vectoriels (ESV), Centre Interdisciplinaire de Recherches Médicales de Franceville (CIRMF), France-ville, Gabon;Laboratoire de Physiologie animale et Pharmacologie, Unité de recherche Agrobiologie, Université des Sciences et Techniques de Ma-suku (USTM), Franceville, Gabon)

机构地区：[1]Laboratoire de Biologie Moléculaire et Cellulaire, Equipe de Microbiologie (LABMC), Unité de Recherche Agrobiologie, Université des Sciences et Techniques de Masuku (USTM), Franceville, Gabon [2]Laboratoire de Bactériologie, Unité de Recherche d’Analyses Médicales (URAM), Centre Interdisciplinaire de Recherches Médicales de Franceville (CIRMF), Franceville, Gabon [3]Unité d’Ecologie des Systèmes Vectoriels (ESV), Centre Interdisciplinaire de Recherches Médicales de Franceville (CIRMF), France-ville, Gabon [4]Laboratoire de Physiologie animale et Pharmacologie, Unité de recherche Agrobiologie, Université des Sciences et Techniques de Ma-suku (USTM), Franceville, Gabon

出　　处：《Open Journal of Medical Microbiology》2023年第4期276-291,共16页医学微生物学（英文）

摘　　要：Background and Purpose: The reintroduction of colistin as a last resort treatment against multi-resistant Gram-negative bacilli, is currently challenged by the emergence of colistin-resistant bacteria. The aim of this study was to assess the susceptibility of Pseudomonas and Acinetobacter strains to colistin, to identify carbapenemase production, and to investigate the plasmid genes involved in colistin resistance and carbapenemase production. Methodology: In order to establish the susceptibility profiles of 17 strains of Pseudomonas and Acinetobacter to colistin, their Minimum Inhibitory Concentrations (MICs) were determined using the liquid microdilution method. The possible production of carbapenemases was investigated with the modified Carbapenem Inactivation Method (mCIM). The search for genes encoding carbapenemases (bla_OXA, bla_IMP, bla_Carba) and those responsible for plasmid resistance to colistin (mcr-1 and mcr-2) was performed by conventional PCR. Results and Conclusion: Ninety-four percent (94%) (16/17) of the strains were resistant to colistin. Intraspecies distribution was 50% (8/16), 31% (5/16), 13% (2/16) and 6% (1/16) for Acinetobacter baumannii, Pseudomonas aeruginosa, Pseudomonas luteola, and Pseudomonas fluorescens, respectively. Twenty-nine percent (29%) (6/17) of the strains produced carbapenemases. No mcr-1 and mcr-2 plasmid genes were detected. On the other hand, 17.6% (3/17) of the strains possessed the carbapenemase genes distributed as follows: Carba type (60%), OXA type (40%) and IMP type (0%). The results of this study highlight a high resistance to colistin in strains belonging to the genera Acinetobacter and Pseudomonas, and some of these strains produce carbapenemases.Background and Purpose: The reintroduction of colistin as a last resort treatment against multi-resistant Gram-negative bacilli, is currently challenged by the emergence of colistin-resistant bacteria. The aim of this study was to assess the susceptibility of Pseudomonas and Acinetobacter strains to colistin, to identify carbapenemase production, and to investigate the plasmid genes involved in colistin resistance and carbapenemase production. Methodology: In order to establish the susceptibility profiles of 17 strains of Pseudomonas and Acinetobacter to colistin, their Minimum Inhibitory Concentrations (MICs) were determined using the liquid microdilution method. The possible production of carbapenemases was investigated with the modified Carbapenem Inactivation Method (mCIM). The search for genes encoding carbapenemases (bla_OXA, bla_IMP, bla_Carba) and those responsible for plasmid resistance to colistin (mcr-1 and mcr-2) was performed by conventional PCR. Results and Conclusion: Ninety-four percent (94%) (16/17) of the strains were resistant to colistin. Intraspecies distribution was 50% (8/16), 31% (5/16), 13% (2/16) and 6% (1/16) for Acinetobacter baumannii, Pseudomonas aeruginosa, Pseudomonas luteola, and Pseudomonas fluorescens, respectively. Twenty-nine percent (29%) (6/17) of the strains produced carbapenemases. No mcr-1 and mcr-2 plasmid genes were detected. On the other hand, 17.6% (3/17) of the strains possessed the carbapenemase genes distributed as follows: Carba type (60%), OXA type (40%) and IMP type (0%). The results of this study highlight a high resistance to colistin in strains belonging to the genera Acinetobacter and Pseudomonas, and some of these strains produce carbapenemases.

关 键 词：PSEUDOMONAS ACINETOBACTER CARBAPENEMASE COLISTIN Suceptibility 

分 类 号：R44[医药卫生—诊断学]