2株产IMP型碳青霉烯酶阴沟肠杆菌的耐药特点及全基因组测序分析
作者: |
1,2王华,
3宿俊彪,
4庞丹,
2胡志德,
2王俊瑞,
1,2郑文琪
1 内蒙古医科大学基础医学院寄生虫学教研室,呼和浩特 010050 2 内蒙古医科大学附属医院检验科,呼和浩特 010050 3 内蒙古自治区人民医院检验科,呼和浩特 010020 4 内蒙古自治区妇幼保健院检验科,呼和浩特 010020 |
通讯: |
王俊瑞
Email: wangjunrui123@yeah.net 郑文琪 Email: zhengwenqi2011@163.com |
DOI: | 10.3978/j.issn.2095-6959.2022.06.002 |
基金: | 内蒙古自治区自然科学基金面上项目(2020MS08126);2020年度内蒙古自治区“草原英才”工程青年创新创业人才培养计划;2021年度内蒙古医科大学校级面上项目(YKD2021MS011)。 |
摘要
Characteristics of drug resistance and whole-genome sequencing of two IMP carbapenemase-producing Enterobacter cloacae strains
CorrespondingAuthor: WANG Junrui Email: wangjunrui123@yeah.net
DOI: 10.3978/j.issn.2095-6959.2022.06.002
Foundation: This work was supported by the Natural Science Foundation of Inner Mongolia Autonomous Region (2020MS08126), the 2020 “Grassland Talents” Project Youth Innovation and Entrepreneurship Talent Training Program of Inner Mongolia, and the General Foundation of Inner Mongolia Medical University (YKD2021MS011), China.
Abstract
Objective: To understand the drug resistance profile and genetic characteristics of IMP-producing Enterobacter cloacae strains. Methods: Two IMP-producing carbapenem-resistant Enterobacter cloacae (CRECL) were isolated from Hohhot from July 2017 to June 2021, termed FY-1 and Y-2, respectively. Species identification was performed using the VITEK-2 compact system and matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS). Antimicrobial susceptibility testing was performed using the standard agar microdilution method. Whole-genome sequencing technology was applied to analyze the characteristics of drug resistance-related molecular, plasmid homology and genetic evolution. Results: FY-1 was resistant to ceftazidime/avibactam, fosfomycin and most of the β-lactam antibiotics. While intermediate to polymyxins B, and sensitive to tobramycin, gentamicin, ciprofloxacin, chloramphenicol, aztreonam and amikacin. Y-2 was resistant to all antibiotics tested except for polymyxin B, fosfomycin and amikacin . Both FY-1 and Y-2 contain one chromosome and three circular plasmids. FY-1 carried drug resistance genes fosA, ACT-7, TEM-1B and blaIMP-1, and efflux pump system-related gene mdf(A). Y-2 carried drug-resistant genes fosA, ACT-16, aac(6’)-Ib-cr, CTX-M-3, TEM-1B and blaIMP-8, and efflux pump system-related genes OqxA, OqxB and mdf(A). The IMP subtypes of FY-1 and Y-2 were IMP-1 and IMP-8, respectively, and both of them were located on plasmids. These two plasmids were highly homologous. The sequences of FY-1 and Y-2 were ST175 and ST114, respectively. Homology analysis suggested that strains FY-1 and Y-2 were closely related to the CRECL strains isolated from Czech Republic and Netherlands. Conclusion: The antimicrobial resistance of IMP-producing CRECL strains is severe, and their genetic relationship is high in homology. Antimicrobial resistance and molecular biology research of CRECL should be monitored in clinical.