目的研究替加环素与临床常用抗生素对碳青霉烯耐药高毒力肺炎克雷伯菌(hypervirulent and carbapenemresistant Klebsiella pneumonia,CR-HvKP)的体外联合抗菌活性。方法收集2017~2019年河北医科大学第二医院临床分离非重复性CR-HvKP共2...目的研究替加环素与临床常用抗生素对碳青霉烯耐药高毒力肺炎克雷伯菌(hypervirulent and carbapenemresistant Klebsiella pneumonia,CR-HvKP)的体外联合抗菌活性。方法收集2017~2019年河北医科大学第二医院临床分离非重复性CR-HvKP共20株。应用微量肉汤稀释法测定替加环素与5种抗生素的最低抑菌浓度(MIC),采用棋盘稀释法检测替加环素与5种抗生素(多黏菌素、头孢哌酮钠/舒巴坦钠、美罗培南、阿米卡星、磷霉素钠)的联合药敏试验。结果20株CR-HvKP主要来源于呼吸ICU 13例(65%),均为ST11型,碳青霉烯酶基因均为KPC-2型。血清型12株(60%)为K2型,为主要的血清型,1株(5%)为K1型。拉丝试验及毒力基因rmpA2均为阳性。替加环素与多黏菌素出现协同作用,百分比为60%。替加环素与美罗培南、磷霉素钠、头孢哌酮钠/舒巴坦钠均未出现协同作用。结论替加环素与多黏菌素体外联合有协同作用,可供临床作为参考治疗CR-HvKP感染。展开更多
目的研究碳青霉烯耐药高毒力肺炎克雷伯菌(hypervirulent and carbapenem-resistant Klebsiella pneumonia,CR-HvKP)实验室检测及临床转归相关危险因素。方法回顾性研究2016年12月~2017年12月河北医科大学第二医院CR-HvKP感染患者20例,...目的研究碳青霉烯耐药高毒力肺炎克雷伯菌(hypervirulent and carbapenem-resistant Klebsiella pneumonia,CR-HvKP)实验室检测及临床转归相关危险因素。方法回顾性研究2016年12月~2017年12月河北医科大学第二医院CR-HvKP感染患者20例,对患者临床资料进行分析,采用PCR检测毒力基因(rmpA和rmpA2)、血清型(K1和K2)以及碳青霉烯酶基因(KPC-2,NDM-1,OXA,VIM和IMP)。结果20例CR-HvKP感染患者中,毒力基因rmpA2均为阳性,拉丝试验阳性17例(85%),K2血清型16例(80%)和碳青霉烯酶基因KPC-2型18例(90%)。标本来源主要为痰/肺泡灌洗液16例(80%),治疗好转9例(45%)和治疗无效11例(55%)。患者使用气管插管辅助呼吸以及感染并发症危及生命的感染性休克治疗无效和好转比较,差异均具有统计学意义(χ^2=5.690~7.593,均P<0.05)。结论CR-HvKP感染临床治愈率低,传播性强,应引起高度重视。展开更多
The co-occurrence of plasmid-mediated multidrug resistance and hypervirulence in epidemic carbapenem-resistant Klebsiella pneumoniae has emerged as a global public health issue.In this study,an ST23 carbapenem-resista...The co-occurrence of plasmid-mediated multidrug resistance and hypervirulence in epidemic carbapenem-resistant Klebsiella pneumoniae has emerged as a global public health issue.In this study,an ST23 carbapenem-resistant hyper-virulent K.pneumoniae(CR-HvKP)strain VH1-2 was identified from cucumber in China and harbored a novel hybrid plasmid pVH1-2-VIR.The plasmid pVH1-2-VIR carrying both virulence and multidrug-resistance(MDR)genes was likely generated through the recombination of a virulence plasmid and an IncFIIK conjugative MDR plasmid in clinical ST2318622 isolated from a sputum sample.The plasmid pVH1-2-VIR exhibited the capacity for transfer to the clinical ST11 carbapenem-resistant K.pneumoniae(CRKP)strain via conjugation assay.Acquisition of pVH1-2-VIR plasmid directly converted a CRKP into CR-HvKP strain characterized by hypermucoviscosity,heightened virulence for Galleria mellonella larvae,and increased colonization ability in the mouse intestine.The emergence of such a hybrid plasmid may expedite the spread of CR-HvKP strains,posing a significant risk to human health.展开更多
文摘目的研究碳青霉烯耐药高毒力肺炎克雷伯菌(hypervirulent and carbapenem-resistant Klebsiella pneumonia,CR-HvKP)实验室检测及临床转归相关危险因素。方法回顾性研究2016年12月~2017年12月河北医科大学第二医院CR-HvKP感染患者20例,对患者临床资料进行分析,采用PCR检测毒力基因(rmpA和rmpA2)、血清型(K1和K2)以及碳青霉烯酶基因(KPC-2,NDM-1,OXA,VIM和IMP)。结果20例CR-HvKP感染患者中,毒力基因rmpA2均为阳性,拉丝试验阳性17例(85%),K2血清型16例(80%)和碳青霉烯酶基因KPC-2型18例(90%)。标本来源主要为痰/肺泡灌洗液16例(80%),治疗好转9例(45%)和治疗无效11例(55%)。患者使用气管插管辅助呼吸以及感染并发症危及生命的感染性休克治疗无效和好转比较,差异均具有统计学意义(χ^2=5.690~7.593,均P<0.05)。结论CR-HvKP感染临床治愈率低,传播性强,应引起高度重视。
基金supported in part by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(32121004)Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2019BT02N054)+4 种基金Laboratory of Lingnan Modern Agriculture Project(NT2021006)Guangdong Major Project of Basic and Applied Basic Research(grant 2020B0301030007)Innovation Team Project of Guangdong University(2019KCXTD001),the 111 Project(grant D20008)Natural Science Foundation of Shandong Province of China(ZR2022MC001)the Scientific and Technological Projects of Qingdao(19‐6‐1‐94‐nsh).
文摘The co-occurrence of plasmid-mediated multidrug resistance and hypervirulence in epidemic carbapenem-resistant Klebsiella pneumoniae has emerged as a global public health issue.In this study,an ST23 carbapenem-resistant hyper-virulent K.pneumoniae(CR-HvKP)strain VH1-2 was identified from cucumber in China and harbored a novel hybrid plasmid pVH1-2-VIR.The plasmid pVH1-2-VIR carrying both virulence and multidrug-resistance(MDR)genes was likely generated through the recombination of a virulence plasmid and an IncFIIK conjugative MDR plasmid in clinical ST2318622 isolated from a sputum sample.The plasmid pVH1-2-VIR exhibited the capacity for transfer to the clinical ST11 carbapenem-resistant K.pneumoniae(CRKP)strain via conjugation assay.Acquisition of pVH1-2-VIR plasmid directly converted a CRKP into CR-HvKP strain characterized by hypermucoviscosity,heightened virulence for Galleria mellonella larvae,and increased colonization ability in the mouse intestine.The emergence of such a hybrid plasmid may expedite the spread of CR-HvKP strains,posing a significant risk to human health.