Virulence genes, efflux pumps, and molecular typing of Klebsiella pneumoniae isolates from North Iran.

IF 3.5 3区 生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Arta Hafezi Birgani, Hamid Reza Goli, Seyed Davar Siadat, Abolfazl Fateh, Vajihe Sadat Nikbin, Fatemeh Sakhaee, Fatemeh Ashrafian, Mohammad Reza Haghshenas, Mehrdad Gholami
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Abstract

Resistant and virulent strains of Klebsiella pneumoniae (K. pneumoniae) are rapidly disseminated among both hospitalized patients and communities, therefore, the identification of the genes responsible for virulence and resistance, along with the clonal relatedness of these strains, could be beneficial in the management of the dissemination of these strains among patients. The aim of the present study was to assess antibiotic susceptibility, virulence and resistance genes, as well as the genetic relatedness of K. pneumoniae strains isolated from patients admitted to four hospitals in Mazandaran, Iran. A total of 95 K. pneumoniae were gathered from hospitalized patients. All isolates were confirmed using biochemical and conventional microbiological methods, followed by the assessment of susceptibility patterns through disk diffusion and the detection of resistance and virulence genes using conventional PCR. The genetic diversity of clinical isolates was determined using the Enterobacterial Repetitive Intergenic Consensus PCR (ERIC-PCR) technique. The resistance frequencies varied, with the highest being for ampicillin/sulbactam (95.8%) and the lowest for fosfomycin (3.2%). Only one strain displayed a non-MDR profile against all antibiotics tested. Virulence-associated genes were detected, such as mrkD (90.5%), fimH (80%), entB (92.6%), iutA (25.3%), and ybtS (68.4%). Genes associated with efflux pumps and outer membrane porins included acrAB (98.9%), tolC (95.8%), mdtK (83.2%), ompK35 (95.8%), and ompK36 (92.6%). Based on ERIC-PCR patterns with a 90% similarity, the isolates were categorized into 17 distinct clusters. While the majority of isolates had a same profile and were grouped in the predominant pattern, 11 isolates were identified as singletons. Our study indicates that the prevalence of MDR K. pneumoniae carrying virulence genes and exhibiting close relatedness underscores the urgent need for effective strategies to control and prevent infections caused by K. pneumoniae.

北伊朗肺炎克雷伯菌分离株的毒力基因、外排泵和分子分型
肺炎克雷伯菌(肺炎克雷伯菌)的耐药和强毒菌株在住院患者和社区中迅速传播,因此,鉴定负责毒力和耐药的基因,以及这些菌株的克隆相关性,可能有助于管理这些菌株在患者中的传播。本研究的目的是评估从伊朗Mazandaran四家医院收治的患者中分离出的肺炎克雷伯菌菌株的抗生素敏感性、毒力和耐药基因以及遗传相关性。从住院患者中共收集到肺炎克雷伯菌95株。所有分离株均采用生化和常规微生物学方法进行鉴定,随后采用圆盘扩散法评估药敏模式,并采用常规PCR检测耐药性和毒力基因。采用肠杆菌重复基因间一致性PCR (ERIC-PCR)技术测定临床分离株的遗传多样性。耐药频率各不相同,氨苄西林/舒巴坦最高(95.8%),磷霉素最低(3.2%)。只有一种菌株对所有测试的抗生素显示出非耐多药特征。检测到毒力相关基因,如mrkD(90.5%)、fimH(80%)、entB(92.6%)、iutA(25.3%)和ybt(68.4%)。外排泵和外膜孔蛋白相关基因包括acrAB(98.9%)、tolC(95.8%)、mdtK(83.2%)、ompK35(95.8%)和ompK36(92.6%)。基于相似性达90%的ERIC-PCR图谱,分离物可分为17个不同的聚类。虽然大多数分离株具有相同的特征,并以优势模式分组,但11株分离株被确定为单株。我们的研究表明,耐多药肺炎克雷伯菌携带毒力基因并表现出密切的相关性,这表明迫切需要有效的策略来控制和预防由肺炎克雷伯菌引起的感染。
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来源期刊
AMB Express
AMB Express BIOTECHNOLOGY & APPLIED MICROBIOLOGY-
CiteScore
7.20
自引率
2.70%
发文量
141
审稿时长
13 weeks
期刊介绍: AMB Express is a high quality journal that brings together research in the area of Applied and Industrial Microbiology with a particular interest in ''White Biotechnology'' and ''Red Biotechnology''. The emphasis is on processes employing microorganisms, eukaryotic cell cultures or enzymes for the biosynthesis, transformation and degradation of compounds. This includes fine and bulk chemicals, polymeric compounds and enzymes or other proteins. Downstream processes are also considered. Integrated processes combining biochemical and chemical processes are also published.
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