胶体金免疫层析法在碳青霉烯酶检测中的价值及应用

目的 系统性评价胶体金免疫层析法在耐碳青霉烯类肠杆菌目细菌(CRE)碳青霉烯酶型检测中的价值及性能情况, 为实验室进行CRE碳青霉烯酶快速检测提供可靠依据。方法 对收集的70株无菌部位分离的CRE菌株同时使用PCR扩增、基 因测序和胶体金免疫层析法进行碳青霉烯酶型检测,以测序结果为参考标准,评价胶体金免疫层析法的实验室检测性能。结 果 检出碳青霉烯酶基因69株,其中KPC型49株,OXA-48型12株,IMP型1株,NDM型3株,同时检出KPC和OXA-48型2株, 同时检出OXA-48和NDM型1株,同时检出KPC和NDM型1株,未检出以上5种基因型1株。胶体金免疫层析法结果与测序结果相 比灵敏度100%,特异度97.1%。不符合2株,其中1株为测序结果同时存在KPC和OXA-48两种型,胶体金检测结果为KPC型;1 株为测序结果同时存在KPC和NDM两种型,胶体金检测结果为KPC型。结论 胶体金免疫层析法作为一种新的CRE碳青霉烯酶 型检测方法,操作简单,结果容易判读,能够短时间内检测出CRE中的产KPC、OXA-48、VIM、IMP和NDM型碳青霉烯酶的 情况,灵敏度和特异度能够满足临床需求,可作为实验室进行碳青霉烯酶型快速检测的方法,指导临床诊治CRE。     

昆明地区耐碳青霉烯类抗生素铜绿假单胞菌的分子流行病学特点及耐药特征分析

目的 研究耐碳青霉烯类抗生素铜绿假单胞菌分子流行病学规律及耐药机制,为临床预防和治疗铜绿假单胞菌的感染提供理论依据。方法 对多中心收集的耐碳青霉烯类抗生素铜绿假单胞菌(carbapenems-resistant Pseudomonas aeruginosa,CRPA)开展多位点序列分型(multilocus sequence typing,MLST)和遗传信息研究,并对碳青霉烯酶基因与外膜孔蛋白OprD编码基因进行序列分析。结果 多位点序列分型方法将81株CRPA分为36个ST型,总体以ST3390(41.98%,34/81)为主,其中有5种为新发现的ST型别;CRPA菌株中碳青霉烯酶基因的检出率较高(65.43%,53/81),尿液标本检出率最高(80.00%,28/35),其中IMP、VIM和NDM型碳青霉烯酶基因检出率分别为37.04%、27.16%和1.23%,未检测到KPC、GES、SPM和OXA-40型碳青霉烯酶基因;oprD基因的序列比对分析发现,高达96.29%(78/81)CRPA临床分离株发生了各种类型的突变,以单个或者多个碱基的插入或缺失为主(76.54%,62/...     

赣南地区耐碳青霉烯类药物铜绿假单胞菌耐药基因检测结果及其对药物的耐药性分析

目的:探究和分析赣南地区耐碳青霉烯类药物铜绿假单胞菌耐药的基因检测结果及其对抗菌药物的耐药性。方法:抽取2017年8月—2018年8月间赣南地区4所综合性医院中分离出的耐碳青霉烯类药物的铜绿假单胞菌80株,同时应用K-B法对80株耐碳青霉烯类药物的铜绿假单胞菌开展药敏试验,并应用PCR法对耐碳青霉烯类药物的铜绿假单胞菌耐药的基因检测,分析其基因检测结果及其对抗菌药物的耐药性。结果:80株耐碳青霉烯类药物铜绿假单胞菌菌株中,69株检出携带碳青霉烯酶基因,其检出率为86.25%,其中NMD型17株占24.64%,IMP型31株占44.93%,KPC型9株占13.04%,VIM型12株占17.39%;另有NMD型合并IMP型1株(1.25%);80株中膜孔蛋白基因OprD2全部缺失;除69株检出携带碳青霉烯酶基因外,其余11株均未检出SPM型金属酶、GIM型金属酶。结论:产碳青霉烯酶在铜绿假单胞菌碳青霉烯类耐药中具有重要意义,NMD酶、IMP酶、KPC酶、VIM酶基因为赣南地区碳青霉烯类药物铜绿假单胞菌耐药的主要基因类型。     

临床耐碳青霉烯类肺炎克雷伯菌分子流行病学特征研究

目的 分析近5年耐碳青霉烯类肺炎克雷伯菌的耐药特性及其携带碳青霉烯酶基因等分子流行病学特征,为有效控制院内感染提供依据。方法 收集2012年1月-2016年12月苏州大学附属第二医院临床标本中分离的耐碳青霉烯类肺炎克雷伯菌,用最低抑菌浓度(minimal inhibitory concentration, MIC)法、KB法分析菌株对抗菌药物的敏感性,用改良碳青霉烯灭活试验检测产碳青霉烯酶表型,并通过聚合酶链反应(polymerase chain reaction, PCR)筛选blaKPC、blaNDM、blaIMP、blaVIM和blaOXA48碳青霉烯酶基因,通过脉冲场凝胶电泳(pulsed-field gel electrophoresis, PFGE)和多位点序列分型(multiple locus sequence typing, MLST)检测细菌的同源性和相关遗传性。统计分析相关患者临床资料。结果 共分离到82株耐碳青霉烯类肺炎克雷伯菌,主要来源于呼吸道43株(52.44%),中段尿12株(14.63%),血液10株(12.20%),无菌体液8株(9.76%),分泌物8株(9.76%),导管1株(1.22%),对头孢菌素类和β-内酰胺类抗菌药物表现为高度耐药(85.4%~100%),碳青霉烯灭活试验阳性率为84.1%。PCR检测到71株细菌携带碳青霉烯酶基因,包括KPC阳性56株(78.87%)、NDM阳性10株(14.08%)、IMP阳性4株(5.64%)、VIM阳性1株(1.41%)。感染患者主要集中在重症监护室(ICU)病区(41株,50.00%)和神经外科(14株,17.07%)。2016年检出的32株中有23株(71.9%)PFGE呈高度同源性,且MLST分型均为ST11,其余7株为ST64型(21.9%),2株为ST23型(6.2%)。结论 本院肺炎克雷伯菌主要分布于ICU,以呼吸道标本检出率最高,对碳青霉烯类耐受主要由于产KPC酶,需进一步加强临床耐药细菌的监测,为临床合理使用抗菌药物和严格执行消毒隔离措施提供参考依据。     

203株耐碳青霉烯类肠杆菌科细菌临床分布特征及耐药基因型分析

目的探讨医院耐碳青霉烯类肠杆菌科细菌( CRE)的分布特征、耐药特点及耐药基因型,为临床 CRE感染治疗提供理论依据。方法收集 2016年 1月至 2018年 9月亳州市人民医院临床分离的 CRE菌株,应用 Vitek 2?Compact全自动微生物分析仪对细菌进行鉴定和药敏试验。采用荧光定量 PCR方法检测 5种耐药基因 KPC、IMP、VIM、NDM?1和 OXA?48在 CRE菌株中的表达。结果共分离 203株 CRE菌株,其中 2016年全年 CRE菌检出 46株,检出率为 0.59%(46/784 9),2017年全年 CRE菌检出 84株,检出率为 0.93%(84/901 1),2018年 1月至 9月 CRE菌检出 73株,检出率为 1.33%(73/547 3);标本类型以痰液标本为主,占 71.43%(145/203);临床科室分布以儿科为主,占 30.05%(61/203);细菌种类以肺炎克雷伯菌为主,占 57.14%(116/203)。药敏结果提示 CRE对碳青霉烯类抗菌药物亚胺培南耐药率为 100.0%,对厄他培南的耐药率为 82.27%,对头孢唑林耐药率为95.07%,对喹诺酮类药物耐药率分别为左氧氟沙星 44.33%,环丙沙星 19.24%;对阿米卡星的敏感率最高,为 77.34%。203株 CRE菌株中 NDM?1基因扩增阳性的菌株有 78株,占 38.42%,KPC基因阳性共有 49株,占 24.14%;其中 NDM?1和 HPC同时阳性者 19例,占 9.36%;IMP基因阳性共有 56株,占 27.59%;OXA?48基因阳性共有 20株,占 9.85%;未扩增出 VIM耐药基因。结论 CRE菌耐药严重,耐药基因以 NDM?1为主,临床医生应加强耐药监测,合理选择抗菌药物。     

铜绿假单胞菌280株基因分型及耐药性分析

目的 分析临床感染铜绿假单胞菌的基因型别、耐药特点以及对碳青霉烯类抗生素的耐药机制。方法 收集重庆市沙坪坝区陈家桥医院2011年6月至2017年7月共6年分离的280株铜绿假单胞菌,主要来源于呼吸内科和ICU病房的痰液标本,进行ERIC-PCR(肠杆菌基因间保守重复序列聚合酶链式反应)分型及药敏试验分析,并检测12种主要的碳青霉烯酶基因的携带情况。结果 分型结果表明主要存在A、G、H三种优势型别的流行,细菌对抗生素的耐药率普遍低于全国耐药监测数据,对碳青霉烯类抗生素亚胺培南和美罗培南的平均不敏感率分别为10.4%和7.1%。在35株碳青霉烯类抗生素不敏感菌株中,碳青霉烯酶IMP和VIM的携带率分别为8.57%和5.71%。结论 肺部感染以及A、G、H三种优势型别细菌是铜绿假单胞感染防控的重点对象,耐碳青霉烯类抗生素菌株中主要携带IMP和VIM两种常见的碳青霉烯酶基因,但阳性率较低。但碳青霉烯类抗生素耐药率逐年升高,仍应引起重视。     

罗定地区临床耐碳青霉烯G-杆菌常见碳青霉烯酶基因检测及流行病学研究

目的 选取罗定地区作为研究对象,分析临床耐碳青霉烯G-杆菌(CRGNB)常见碳青霉烯酶基因检测及流行病学,为CRGNB感染预防提供科学临床参考依据。方法 收集2019年5月至2020年6月罗定地区CRGNB 150株,提取CRGNB的全基因组DNA,采用聚合酶连反应(PCR)检测碳青霉烯酶基因,并开展多位点序列分型观察。结果 从碳青霉烯类抗生素药敏性结果对比来看,本实验150株菌株中有10株对厄他培南(ETP)耐药,耐药率为6.7%;8株对亚胺培南(IMP)耐药,耐药率为5.3%;6株对美罗培南(MEM)耐药,耐药率为4.0%。从碳青霉烯类抗生素药敏性结果对比来看,本实验10株在乙二胺四乙酸(EDTA)协同实验中显示阳性结果,EDTA协同实验阳性率6.7%。肺炎克雷伯菌产IMP类型的金属酶有12株,肺炎克雷伯菌产KPC类型的金属酶有4株,阴沟肠杆菌产IMP类型的金属酶有3株,三种菌种均出现了多种克隆型。结论 CRGNB常见碳青霉烯酶基因以IMP类型为主,其次为KPC类型,本研究中未发现其他的新基因亚型。碳青霉烯菌株产生过程中可能会出现多种克隆细菌类型,需要临床高度关注,并采取有效地措施预防耐药菌株的克隆式传播。     

某院2011年12月-2012年12月ICU亚胺培南耐药鲍曼不动杆菌碳青霉烯酶基因型的研究

目的:对重症监护病房(ICU)临床分离的亚胺培南耐药鲍曼不动杆菌的耐药性及碳青霉烯酶基因型进行研究,为临床防治提供理论依据。方法:收集2011年12月-2012年12月青岛市海慈医疗集团ICU临床分离的亚胺培南耐药鲍曼不动杆菌65株,采用K-B琼脂纸片扩散法进行药敏试验,聚合酶链反应(PCR)检测OXA-23、OXA-24、OXA-51、OXA-58、IMP、VIM 6种碳青霉烯酶基因,并对PCR产物进行测序。结果:65株亚胺培南耐药鲍曼不动杆菌除对头孢哌酮/舒巴坦、阿米卡星、多黏菌素B的耐药率较低外,对其他药物的耐药率均在90%以上。65株扩增出OXA-51基因,56株扩增出OXA-23基因,6株扩增出VIM基因,检出率分别为100%、86.15%、9.23%,OXA-24、OXA-58及IMP均未检出;PCR产物测序表明与GenBank相关基因同源性为100%。结论:该单位ICU亚胺培南耐药鲍曼不动杆菌的耐药现象严重;OXA-23型碳青霉烯酶的产生是鲍曼不动杆菌对碳青霉烯类药物耐药的重要机制之一。     

产KPC酶肺炎克雷伯菌耐碳青霉烯类药物的分子机制研究

摘要：目的 研究临床分离肺炎克雷伯菌对碳青霉烯类药物的分子耐药机制,为临床合理用药提供理论及实验依据。方 法 收集2020年1月-2020年12月皖南医学院弋矶山医院临床分离非重复肺炎克雷伯菌株923株,利用全自动微生物分析系统进 行菌种鉴定及药敏分析,并用16S rRNA PCR扩增产物测序验证菌种,K-B法复核碳青霉烯类药物耐药情况;胶体金法对耐碳青 霉烯类肺炎克雷伯菌(carbapenem-resistant Klebsiella pneumonia, CRKP)菌株进行碳青霉烯酶的表型检测,并用碳青霉烯酶PCR扩 增结果进行验证;同时利用全自动微生物分析系统对产KPC酶CRKP产超广谱β-内酰胺酶(extended-spectrum β-lactamases, ESBLs) 进行检测,并用ESBLs耐药相关基因PCR扩增结果进行验证;多位点序列分型技术(MLST)对产KPC酶CRKP进行序列分型 (ST)。 结果 923株肺炎克雷伯菌中256株(27.74%)为CRKP,其中183株携带blaKPC,ST分型为ST11型和ST12型,产KPC酶CRKP 携带3种ESBLs基因blaTEM-1、blaSHV-11和blaCTX-M-1。结论 CRKP产碳青霉烯酶以KPC酶型为主,blaKPC可合并3种ESBLs的产生。     

鲍曼不动杆菌耐药性及碳青霉烯酶的研究

目的了解鲍曼不动杆菌耐药谱及碳青霉烯酶的研究。方法用VITEK60型全自动药敏分析系统鉴定药敏系统及纸片扩散法进行药敏实验;PCR扩增和测序分析检测碳青霉烯酶VIM、IMP、OXA-23和OXA-24。结果217株鲍曼不动杆菌中头孢哌酮/舒巴坦耐药率最低,其次是亚胺培南,再者是头孢他啶和哌拉西林/他唑巴坦;头孢哌酮/舒巴坦和头孢他啶的中介率分别是27.6%和19.8%;20株亚胺培南耐药菌中,PCR扩增VIM、IMP和OXA-24均阴性;OXA-23基因扩增显示19株（95%）阳性,PCR产物并经序列分析证实为OXA-23。结论碳青霉烯类抗生素的长期广泛应用使鲍曼不动杆菌的耐药率不断升高;产OXA-23型β-内酰胺酶是本院鲍曼不动杆菌对亚胺培南耐药的重要原因。     

碳青霉烯类耐药肺炎克雷伯菌分子流行病学及耐药机制

目的 研究碳青霉烯类耐药的肺炎克雷伯菌分子流行病学及对碳青霉烯类耐药机制。方法 KB法筛选对碳青霉烯类耐药的肺炎克雷伯菌临床分离株24株,同时采用微量肉汤稀释法测定这些细菌的最低抑菌浓度,改良Hodge实验检测碳青霉烯酶;PCR检测碳青霉烯酶基因(blaKPC、blaIMP、blaNDM、blaVIM、blaIMI、blaSPM、blaNDMOXA-23、blaNDMOXA-24、blaNDMOXA-48和blaNDMOXA-58)。结果 药敏试验显示碳青霉烯类耐药肺炎克雷伯菌具有多重耐药性。PCR扩增碳青霉烯酶基因,blaIMP阳性率为58.3%,经测序为IMP-4,其余均为阴性。结论 肺炎克雷伯菌临床分离株对碳青霉烯类抗生素的耐药机制主要与产IMP-4金属酶有关。     

Activity of ceftazidime-avibactam against carbapenemase-producing Enterobacteriaceae from urine specimens obtained during the infection-carbapenem resistance evaluation surveillance trial (iCREST) in Spain

The increasing rates of carbapenemase-producing Enterobacteriaceae (CPE) represent an important threat to health care systems and treatment of CPE infections is a challenge. The aim of the infection-carbapenem resistance evaluation surveillance trial (iCREST) was to determinate the prevalence of CPE in urine specimens in Spain and to evaluate the in vitro activity of ceftazidime-avibactam. Urine specimens (n?=?11 826) were included and activity of ceftazidime-avibactam and comparators were investigated by broth microdilution in CPE. Carbapenemases were characterised by polymerase chain reaction (PCR) and sequencing as well as by whole genome sequencing (WGS). Overall prevalence of CPE was 1.6%. OXA-48 was the most prevalent (86.8%), followed by KPC (6.9%), VIM (4.8%), NDM (1.1%) and IMP (0.6%) carbapenemases. Klebsiella pneumoniae was the most common carbapenemase producer (87.8%). An uncommon carbapenemase type (IMP-8) in Spain was identify by WGS in an Enterobacter cloacae isolate, reinforcing the utility of surveillance programmes as effectives tools to detect unexpected genes that encode antimicrobial resistance. Ceftazidime-avibactam showed 100% susceptibility in KPC and OXA-48 producers and the rates of susceptibility in CPE non-susceptible to ceftazidime or meropenem were 92.1% and 96.9%, respectively. Ceftazidime-avibactam could be considered an adequate treatment option for urinary tract infections caused by KPC and OXA-48 producers.     

Real-time TaqMan PCR for rapid detection of genes encoding five types of non-metallo- (class A and D) carbapenemases in Enterobacteriaceae

A real-time TaqMan multiplex polymerase chain reaction (PCR) assay was developed to detect genes encoding five types of serine carbapenemases (GES, IMI/NMC, KPC, OXA-48 and SME). The assay was validated using control strains known to produce each of these types of enzyme and was then further assessed by ‘blindly’ testing 59 previously characterised clinical isolates, including 19 with serine (KPC or OXA-48) carbapenemases, 22 with metallo- (IMP, VIM or NDM) carbapenemases, and 18 with carbapenem resistance contingent upon extended-spectrum β-lactamase (ESBL) or AmpC production combined with porin loss. The assay detected and correctly assigned the serine carbapenemases in all five positive control strains and in 19 clinical isolates. No false-positive results were seen for isolates with metallo-enzymes or for those that lacked a carbapenemase. The five serine carbapenemase genotypes could also be distinguished by melt-curve analysis or the molecular size of the amplicons.     

What remains against carbapenem-resistant Enterobacteriaceae? Evaluation of chloramphenicol,ciprofloxacin, colistin,fosfomycin, minocycline,nitrofurantoin, temocillin and tigecycline

Carbapenem-resistant Enterobacteriaceae present an increasing and diverse problem, including strains of multiple species with metallo-β-lactamases (IMP, NDM or VIM) and non-metallo (KPC and OXA-48) enzymes as well as those combining an extended-spectrum β-lactamase (ESBL) or AmpC enzyme with porin loss. Most strains, except those with OXA-48 alone, are broadly resistant to β-lactams and have multiple aminoglycoside-modifying enzymes; those with NDM-1 carbapenemase typically also have 16S rRNA methylases, conferring complete aminoglycoside resistance. In this study, the activity of chloramphenicol, ciprofloxacin, colistin, fosfomycin, minocycline, nitrofurantoin, temocillin and tigecycline was evaluated against 81 carbapenem-resistant Enterobacteriaceae isolates from the UK. Testing was performed by the Clinical and Laboratory Standards Institute (CLSI) agar dilution method. Chloramphenicol, ciprofloxacin and nitrofurantoin inhibited <25% of the isolates at the breakpoint, whereas colistin was active against 75/81 isolates (92.6%), the exceptions being four Klebsiella pneumoniae and Enterobacter cloacae isolates along with members of inherently resistant genera. Fosfomycin was active against 49/81 isolates (60.5%), including 7/7 Escherichia coli, 16/20 Enterobacter and Citrobacter spp., but only 25/52 Klebsiella spp. Tigecycline was active against 38/81 isolates (46.9%) and was intermediate against another 27 (33.3%), with resistance scattered amongst K. pneumoniae and Enterobacter spp. The activity of colistin, fosfomycin and tigecycline was unrelated to the isolates' carbapenem resistance mechanisms. Temocillin was fully active [minimum inhibitory concentration (MIC) ≤8 mg/L] against only 4/81 isolates (4.9%), but inhibited a further 22 isolates (27.2%) at the British Society for Antimicrobial Chemotherapy (BSAC) urinary breakpoint (32 mg/L), predominantly comprising those isolates with combinations of impermeability and an ESBL or AmpC enzyme, along with 6/11 isolates producing KPC carbapenemases. Studies with transconjugants and transformants confirmed the small effect of KPC enzymes against temocillin, whereas OXA-48 and NDM-1 conferred clear resistance.     

24株洋葱伯克霍尔德菌耐药性分析及β-内酰胺酶耐药基因检测

目的 了解洋葱伯克霍尔德菌耐药情况及耐药基因,为临床用药提供指导.方法 琼脂稀释法检测洋葱伯克霍尔德菌对10种抗生素的最低抑菌浓度(MIC); PCR法测定β-内酰胺酶耐药基因.结果 洋葱伯克霍尔德菌对头孢呋辛耐药率最高,达71.5%,其次氨曲南69.9%,左旋氧氟沙星66.7%,美罗培南66.6%,氯霉素62%;耐药...     

Cefiderocol: A Novel Siderophore Cephalosporin against Multidrug-Resistant Gram-Negative Pathogens

Cefiderocol (CFDC), (formerly S-649266), is a novel injectable siderophore cephalosporin developed by Shionogi & Co., Ltd., with potent in vitro activity against Gram-negative pathogens including multidrug-resistant (MDR) Enterobacteriaceae and non-fermenting organisms, such as Pseudomonas aeruginosa, Acinetobacter baumannii, Burkholderia cepacia, and Stenotrophomonas maltophilia. Characterized by its siderophore catechol-moiety, CFDC uses a “trojan-horse approach” to navigate through the bacterial periplasmic space, thus evading various beta-lactam degrading enzymes and other mechanisms of resistance present in Gram-negative bacteria. More specifically in carbapenem-resistant Enterobacteriaceae, CFDC has been shown to have activity against extended spectrum beta-lactamases (ESBLs), such as CTX-type, SHV-type, and TEM-type, as well as the Ambler classes of beta-lactamases, including class A (KPC), class B (NDM, IMP, and VIM), class C (AmpC), and class D (OXA, OXA-24, OXA-48, and OXA-48-like). In addition to the strong activity that CFDC has been shown to have against MDR P. aeruginosa, it has also displayed activity against the OXA-23, OXA-24, and OXA-51, beta-lactamases commonly found in MDR A. baumannii. Cefiderocol was recently approved by the US Food and Drug Administration (FDA) for use in complicated urinary tract infections (cUTI), including pyelonephritis, for use in patients 18 years or older with limited or no alternative options for treatment, and is currently being evaluated in a phase III trial for use in nosocomial pneumonia caused by Gram-negative pathogens. The unique features and enhanced activity of CFDC suggest that it is likely to serve as a viable therapeutic option in the treatment of MDR Gram-negative infections. The purpose of this review is to provide an overview of previously published literature explaining CFDC’s pharmacology, pharmacokinetic / pharmacodynamic (PK / PD) properties, microbiologic activity, resistance mechanisms, safety parameters, dosing and administration, clinical data, and potential place in therapy.     

我院实施《处方管理办法》前后围术期患者抗菌药物预防性应用分析

目的:评价我院实施《处方管理办法》(简称《办法》)前、后围术期患者抗菌药物预防性应用情况。方法:调查我院2006年1月～2007年12月(实施前)及2008年1月～2009年6月(实施后)出院患者病历288例和241例,对围术期患者预防性应用抗菌药物情况进行对比分析。结果:《办法》实施前、后我院围术期患者抗菌药物预防性应用率均达100%,均约有50%存在用药时间过长现象。尽管抗菌药物用药时间合理率由实施前的4.34%上升至25.93%,但抗菌药物选择等级呈上升趋势,不合理联用问题仍较突出。结论:我院应进一步完善不合理用药医师责任制度,加强医务工作者合理用药教育,促进抗菌药物合理应用。     

耐亚胺培南铜绿假单胞菌对β-内酰胺类抗菌药物耐药相关基因的研究

目的:研究耐亚胺培南铜绿假单胞菌(IMPRPa)β-内酰胺类抗菌药物耐药相关基因的存在情况。方法:对60株临床分离的IMPRPa,采用聚合酶链(PCR)方法检测β-内酰胺类抗菌药物耐药相关基因IMP、VIM、OprD2,并对部分IMP、VIM基因的PCR扩增产物进行序列分析。结果:60株受试菌中,β-内酰胺类抗菌药物耐药相关基因检测阳性为:IMP7株,VIM18株,有3株菌同时携带IMP、VIM基因,IMP、VIM基因序列分析为IMP-1型和VIM-2型,OprD2基因缺失29株。结论:OprD2蛋白通道缺失和产金属β-内酰胺酶是IMPRPa耐亚胺培南的主要机制。