摘要
目的通过应用全基因组测序(whole genome sequencing,WGS)技术分析某三级医疗机构耐碳青霉烯类抗生素鲍曼不动杆菌(carbapenem-resistant Acinetobacter baumannii,CRAB)的耐药基因、毒力因子及同源性。方法收集该院2020年1月至3月重症监护病房(Intensive care unit,ICU)、神经外科分离的11株医院感染CRAB菌株,通过二代测序平台进行全基因组测序,应用基因组流行病学中心(Center for genomic epidemiology,CGE)ResFinder 4.0软件分析其耐药基因型,并应用MORPHEUS在线制作热图,应用毒力因子数据库(virulence factors of pathogenic bacteria,VFDB)VFanalyzer软件筛选毒力因子,应用MLST软件检测菌株的ST型,应用Kaptive软件检测荚膜型,应用CSI Phylogeny 1.4软件及FigTree v1.4.4软件构建最大似然树(maximum likelihood tree,MLT)以分析其同源性。结果11株CRAB对亚胺培南、美罗培南、头孢菌素、环丙沙星均呈现耐药,而对阿米卡星、左氧氟沙星耐药的菌株株数较少。11株CRAB共检测出18种耐药基因,11株同时携带碳青霉烯酶耐药基因bla_(OXA-23)和bla_(OXA-66),β-内酰胺酶耐药基因以bla_(TEM-1D)和bla_(ADC-25)为主,大部分菌株携带多种外排泵相关耐药基因及抗菌药物修饰酶耐药基因。11株CRAB均携带多种毒力因子,包括外膜孔蛋白、脂多糖、生物膜、外排泵、磷脂酶和效应蛋白等,如OmpA、Lps、Csu、Pga、Ade、Plc、Bas、Bau、Ent、Hem、Aba、Bfm、Pbp和Kat等。11株CRAB均为ST2-K22型,同源性分析结果显示C组内同源性关系相近,存在院内传播的可能。结论该院CRAB的耐药性、毒力特征复杂多样,同源性分析显示该院存在1种优势克隆株,该克隆株有医院内传播的风险。
Objective To analyze the resistance genes,virulence factors and homology of carbapenemresistant Acinetobacter baumannii(CRAB)in a tertiary medical institution by using whole genome sequencing(WGS)technology.Methods Eleven strians of nosocomial infected CRAB isolates from the Intensive Care Unit(ICU)and neurosurgery of the hospital from January 2020 to March 2020 were collected.The next-generation sequencing platform was used for WGS.ResFinder 4.0 software of Center for Genomic Epidemiology(CGE)was used to analyze the drug resistance genes.VFanalyzer software of virulence factors database(VFDB)was used to screen the virulence factors.The MLST software was used to detect the ST type of the strains,and the Kaptive software was used to detect the capsule types.The heat maps were made by MORPHEUS online,the maximum likelihood tree was constructed by CSI Phylogeny 1.4 software and FigTree v1.4.4 software to analyze the homology of strains.Results Eleven strians of CRAB were resistant to imipenem,meropenem,cephalosporin and ciprofloxacin,while the number of strains resistant to amikacin and levofloxacin was relatively small.Eleven strians of CRAB carried eighteen kinds of drug resistance genes,all of which carried the carbapenemase resistance gene bla_(OXA-23)and bla_(OXA-66).The eleven strians all carriedβ-lactamase resistance genes,mainly including bla_(TEM-1D)and bla_(ADC-25).Most of the strains carried multiple efflux pump-related and antimicrobial drug-modifying enzyme resistance genes.The eleven strians all carried many kinds of virulence factors,including outer membrane porin,lipopolysaccharide,biomembrane,efflux pump,phospholipase,effector protein,etc,such as OmpA,Lps,Csu,Pga,Ade,Plc,Bas,Bau,Ent,Hem,Aba,Bfm,Pbp,and Kat.The 11 strains of CRAB were all ST2-K22 type.The homology analysis result showed that the homology relationship in group C was similar,and there was the possibility of nosocomial transmission.Conclusion The resistance and virulence characteristics of CRAB in the hospital were complex and diverse.
作者
胡小骞
王琴
Hu Xiao-qian;Wang Qin(The Second Hospital of Anhui Medical University,Hefei 230601)
出处
《中国抗生素杂志》
CAS
CSCD
北大核心
2022年第9期939-945,共7页
Chinese Journal of Antibiotics
基金
国家自然科学基金项目(No.81902056)
