Molecular Characterization of Carbapenemase-Nonproducing Clinical Isolates of Escherichia coli (from a Thai University Hospital) with Reduced Carbapenem Susceptibility
-
- Nuramrum Sawitree
- Medical Sciences Program, Khon Kaen University
-
- Chanawong Aroonwadee
- Centre for Research and Development of Medical Diagnostic Laboratories (CMDL), Faculty of Associated Medical Sciences, Khon Kaen University
-
- Lunha Kamonwan
- Centre for Research and Development of Medical Diagnostic Laboratories (CMDL), Faculty of Associated Medical Sciences, Khon Kaen University
-
- Lulitanond Aroonlug
- Centre for Research and Development of Medical Diagnostic Laboratories (CMDL), Faculty of Associated Medical Sciences, Khon Kaen University
-
- Sangka Arunnee
- Centre for Research and Development of Medical Diagnostic Laboratories (CMDL), Faculty of Associated Medical Sciences, Khon Kaen University
-
- Wilailuckana Chotechana
- Centre for Research and Development of Medical Diagnostic Laboratories (CMDL), Faculty of Associated Medical Sciences, Khon Kaen University
-
- Angkititrakul Sunpetch
- Research Group for Preventive Technology in Livestock, Department of Veterinary Public Health, Faculty of Veterinary Medicine, Khon Kaen University
-
- Charoensri Nicha
- Centre for Research and Development of Medical Diagnostic Laboratories (CMDL), Faculty of Associated Medical Sciences, Khon Kaen University
-
- Wonglakorn Lumyai
- Clinical Microbiology Unit, Srinagarind Hospital, Khon Kaen University
-
- Chaimanee Prajuab
- Clinical Microbiology Unit, Srinagarind Hospital, Khon Kaen University
-
- Chetchotisakd Ploenchan
- Department of Medicine, Faculty of Medicine, Khon Kaen University
書誌事項
- タイトル別名
-
- Molecular Characterization of Carbapenemase-Nonproducing Clinical Isolates of <i>Escherichia coli</i> (from a Thai University Hospital) with Reduced Carbapenem Susceptibility
この論文をさがす
抄録
<p>Twelve nonreplicate carbapenemase-negative ertapenem (ETP)-nonsusceptible (CNENS) Escherichia coli isolates obtained at a Thai university hospital between 2010 and 2014 were characterized and compared with 2 carbapenemase-producing E. coli isolates from the same hospital. Eight unique pulsed-field gel electrophoresis patterns were obtained. All the isolates produced CTX-M-15 β-lactamase and 2 either coexpressed CMY-2 cephalosporinase or showed increased efflux pump activity. Amino acid sequence analysis revealed that an OmpF defect (in 7 isolates) due to mutations generating truncated proteins or an IS1 insertion was more prevalent than a defect in OmpC was (no truncated proteins detected). Seven out of 10 isolates possessing OmpC variants with any OmpF defect were weakly ETP-resistant (minimum inhibitory concentrations [MICs] of 1–4 μg/mL) and imipenem (IPM)- and meropenem (MEM)-susceptible (MICs 0.125–0.5 μg/mL). Two isolates with ompC PCR-negative results and an OmpF defect showed higher carbapenem MICs (8–32, 1–8, and 1–4 μg/mL for ETP, IPM, and MEM, respectively) with the highest MICs associated with the additional efflux pump activity. Both carbapenemase producers possessing CTX-M-15 and a porin background identical to that in the CNENS isolates showed ETP, IPM, and MEM MICs of 128–256, 8, and 2–32 μg/mL, respectively. These findings suggest that a porin defect combined with CTX-M-15 production is the major mechanism of low carbapenem susceptibility among our CNENS isolates, which have potential to become strongly carbapenem-resistant because of additional carbapenemase or efflux pump activities.</p>
収録刊行物
-
- Japanese Journal of Infectious Diseases
-
Japanese Journal of Infectious Diseases 70 (6), 628-634, 2017
国立感染症研究所 Japanese Journal of Infectious Diseases 編集委員会
- Tweet
詳細情報 詳細情報について
-
- CRID
- 1390001206241208704
-
- NII論文ID
- 130006210306
-
- NII書誌ID
- AA1132885X
-
- ISSN
- 18842836
- 13446304
-
- NDL書誌ID
- 028691639
-
- PubMed
- 28890516
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可