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Multiple detection of hypermucoviscous and hypervirulent strains of Klebsiella pneumoniae: An emergent health care threat.
Acta Microbiologica et Immunologica Hungarica ( IF 1.5 ) Pub Date : 2022-11-22 , DOI: 10.1556/030.2022.01908
Anna Ventura 1 , Elena Addis 1 , Anna Bertoncelli 1 , Annarita Mazzariol 1
Affiliation  

This study focused on the characterization of 19 hypermucoviscous Klebsiella pneumoniae strains, that were identified from 26 hypermucosal strains. In order to identify hypermucoviscous strains of K. pneumoniae, the string test was applied. This phenotype is known in the literature as one of the virulence factors of this species together with the production of biofilm and other hypervirulence factor genes such as: rmpA, rmpA2, iucA, iroB, peg-344. We also investigated presence of magA gene that correlates with the hyper-production of capsule of K1 serotype. Of the strains under study, 13 out of 19 harboured at least one virulence factor.Sequence type (ST) was determined in order to identify known high-risk clones or new emerging high-risk clones and their variability in a single clinical setting. Important STs found among these strains were ST65 and ST29. Carbapenem resistance was also investigated and 4 out of 19 strains harboured at least a carbapenemase: one strain harboured a KPC enzyme alone, one strain carried a KPC and an OXA-48 like, one strain produced OXA-48-like alone, and the last strain harboured two metallo-β-lactamases (VIM-1 and NDM-5) plus OXA-48-like. In particular, this latter strain belongs to ST383, which was recently reported in Northern Italy as a hypervirulent and XDR strain.The global spread of hypervirulent K. pneumoniae is an important epidemiological issue that should be considered in diagnostic and therapeutic managements of patients with K. pneumoniae infections.

中文翻译:

多重检测肺炎克雷伯菌的高粘性和高毒力菌株:一种紧急的医疗保健威胁。

本研究侧重于从 26 株高粘膜菌株中鉴定出的 19 株高粘膜肺炎克雷伯菌菌株的特征。为了鉴定 K. pneumoniae 的高粘稠菌株,应用了线测试。这种表型在文献中被称为该物种的毒力因子之一,以及生物膜和其他超毒力因子基因的产生,例如:rmpA、rmpA2、iucA、iroB、peg-344。我们还研究了与 K1 血清型荚膜过度产生相关的 magA 基因的存在。在研究的菌株中,19 株中有 13 株至少携带一种毒力因子。确定序列类型 (ST) 是为了识别已知的高风险克隆或新出现的高风险克隆及其在单一临床环境中的变异性。在这些菌株中发现的重要 ST 是 ST65 和 ST29。还研究了碳青霉烯类耐药性,19 株菌株中有 4 株至少含有一种碳青霉烯酶:一种菌株仅含有一种 KPC 酶,一种菌株携带一种 KPC 和一种 OXA-48 样酶,一种菌株仅产生 OXA-48 样酶,最后一种菌株菌株含有两种金属-β-内酰胺酶(VIM-1 和 NDM-5)以及 OXA-48 样酶。特别是,后一种菌株属于 ST383,最近在意大利北部被报道为超强毒力和 XDR 菌株。超强毒力肺炎克雷伯菌的全球传播是一个重要的流行病学问题,在 K. pneumoniae 患者的诊断和治疗管理中应考虑. 肺炎感染。一种菌株单独含有 KPC 酶,一种菌株携带 KPC 和 OXA-48 样酶,一种菌株单独产生 OXA-48 样酶,最后一种菌株含有两种金属-β-内酰胺酶(VIM-1 和 NDM-5)加 OXA-48 样。特别是,后一种菌株属于 ST383,最近在意大利北部被报道为超强毒力和 XDR 菌株。超强毒力肺炎克雷伯菌的全球传播是一个重要的流行病学问题,在 K. pneumoniae 患者的诊断和治疗管理中应考虑. 肺炎感染。一种菌株单独含有 KPC 酶,一种菌株携带 KPC 和 OXA-48 样酶,一种菌株单独产生 OXA-48 样酶,最后一种菌株含有两种金属-β-内酰胺酶(VIM-1 和 NDM-5)加 OXA-48 样。特别是,后一种菌株属于 ST383,最近在意大利北部被报道为超强毒力和 XDR 菌株。超强毒力肺炎克雷伯菌的全球传播是一个重要的流行病学问题,在 K. pneumoniae 患者的诊断和治疗管理中应考虑. 肺炎感染。
更新日期:2022-11-22
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