基于全基因组测序的尿路感染耐碳青霉烯类肠杆菌目细菌耐药机制及分子特征研究
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R181.3+2

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国家自然科学基金地区基金项目(82260403)


Resistance mechanisms and molecular characteristics of carbapenem-resistant Enterobacterales in urinary tract infection: a study based on whole-genome sequencing
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    摘要:

    目的 分析尿液来源的耐碳青霉烯类肠杆菌目细菌(CRE)的耐药机制及分子流行病学特征,为尿路CRE感染的防控与治疗提供科学依据。方法 收集2021—2024年南昌大学第一附属医院尿标本分离的97株CRE菌株,使用VITEK 2 Compact全自动微生物鉴定及药敏分析系统进行药敏分析。采用全基因组测序技术分析其耐药基因、质粒类型及分子流行病学特征。结果 纳入测序的97株CRE以肺炎克雷伯菌(75株,77.32%)为主,其次为大肠埃希菌(9株,9.28%)和阴沟肠杆菌(9株,9.28%);菌株主要来自康复医学科(37株,38.15%)。药敏试验显示,CRE对大多数常用抗菌药物的耐药率>90%。92.78%(90/97)的CRE菌株携带碳青霉烯酶基因,仅检出blaKPCblaNDM两种基因型,且以blaKPC-2blaNDM-5亚型为主。CRE携带的质粒类型呈现高度多样性,质粒复制子数量为1~11个,94.85%的菌株携带3种及以上质粒复制子,以IncFII、IncR和IncHI1B最为常见;多位点序列分型(MLST)结果显示,ST11-KL64型和ST11-KL25型是CRKP的主要优势克隆,而耐碳青霉烯类大肠埃希菌和耐碳青霉烯类阴沟肠杆菌呈现明显的克隆多样性。结论 该地区导致尿路感染的CRE耐药形势严峻,主要携带blaKPC-2blaNDM-5型基因,且质粒类型呈现高度多样性。此外,ST11-KL64型和ST11-KL25型是CRKP菌的主要优势克隆,而其他CRE则表现出显著的克隆多样性,应加强监测与防控。

    Abstract:

    Objective To analyze the resistance mechanisms and molecular epidemiological characteristics of carbapenem-resistant Enterobacterales (CRE) from urine, and to provide scientific basis for the prevention, control, and treatment of CRE-associated urinary tract infection. Methods A total of 97 CRE strains isolated from urine specimens from the First Affiliated Hospital of Nanchang University from 2021 to 2024 were collected, and antimicrobial susceptibility testing was performed with VITEK 2 Compact automatic microbial identification and antimicrobial susceptibility analysis system. The resistance genes, plasmid types, and molecular epidemiological characteristics of strains were analyzed by whole-genome sequencing technique. Results Among the sequenced 97 CRE strains, Klebsiella pneumoniae (n=75, 77.32%) was predominant, followed by Escherichia coli (n=9, 9.28%) and Enterobacter cloacae (n=9, 9.28%). Most strains were mainly from the department of rehabilitation medicine (n=37, 38.15%). Antimicrobial susceptibility testing revealed that the resistance rate of CRE to most commonly used antimicrobial agents exceeded 90%; 92.78% (90/97) of CRE carried carbapenemase genes, with only two genotypes (blaKPC and blaNDM) being detected, primarily the blaKPC-2 and blaNDM-5 subtypes. The plasmid types carried by CRE exhibited high diversity, with the number of plasmid replicons ranging from 1 to 11. 94.85% of the strains harbored three or more plasmid replicons, with IncFII, IncR, and IncHI1B being the most prevalent. Multilocus sequence typing (MLST) results showed that ST11-KL64 and ST11-KL25 were the predominant clones of carbapenem-resistant Klebsiella pneumoniae (CRKP), while carbapenem-resistant Escherichia coli (CREC) and carbapenem-resistant Enterobacter cloacae (CRECL) exhibited significant clonal diversity. Conclusion CRE resis-tance in urinary tract infection in this region is severe, with CRE mainly carrying blaKPC-2 and blaNDM-5 genes, with highly diverse plasmid types. In addition, the ST11-KL64 and ST11-KL25 types are the dominant clones of CRKP, while other CREs exhibit significant clonal diversity, monitoring and prevention should be enhanced.

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冯小倩,万娟,李小菊,等.基于全基因组测序的尿路感染耐碳青霉烯类肠杆菌目细菌耐药机制及分子特征研究[J]. 中国感染控制杂志,2026,25(7):945-953. DOI:10.12138/j. issn.1671-9638.20263370.
FENG Xiaoqian, WAN Juan, LI Xiaoju, et al. Resistance mechanisms and molecular characteristics of carbapenem-resistant Enterobacterales in urinary tract infection: a study based on whole-genome sequencing[J]. Chin J Infect Control, 2026,25(7):945-953. DOI:10.12138/j. issn.1671-9638.20263370.

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  • 收稿日期:2025-12-30
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  • 在线发布日期: 2026-07-27
  • 出版日期: 2026-07-28