Journals / Ankara Üniversitesi Veteriner Fakültesi Dergisi / 2019 / Cilt: 66 - Sayı: 4

Determination of antibiotic susceptibility, ESBL genes and pulsed-field gel electrophoresis profiles of extended-spectrum β-lactamase-containing Escherichia coli isolates

Genişlemiş spektrumlu β-laktamaz üreten Escherichia coli izolatlarının antibiyotik duyarlılıklarının, GSBL genlerinin ve pulsed-field jel elektroforez yöntemiyle genotipik profillerinin belirlenmesi

Pages
407–416
Publication Date
2022-10-12
DOI
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In addition, PFGE analysis showed high clonal similarity among E. coli isolates.

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Objective & Hypothesis:The purpose of this study was to determine the phenotypic antibiotic susceptibility patterns, extended-spectrum β-lactamase (ESBL) genes and genotypic profiles of ESBL-positive Escherichia coli strains isolated from urine samples obtained from outpatients with urinary tract infection in Turkey.
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Key Findings & Data:A total of 120 E. coli strains during 2017, 2018, and 2019 (40 patients per year) were examined for antibiotic susceptibility patterns by disc diffusion method, for ESBL genes using PCR and sequencing and for molecular typing by pulsed-field gel electrophoresis (PFGE) method.
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Conclusion & Impact:In addition, PFGE analysis showed high clonal similarity among E. coli isolates.
🔬Design:Research Article
📍Scope:2017 Verileri
⚙️Variables:Domain Parameters

Abstract

The purpose of this study was to determine the phenotypic antibiotic susceptibility patterns, extended-spectrum β-lactamase (ESBL) genes and genotypic profiles of ESBL-positive Escherichia coli strains isolated from urine samples obtained from outpatients with urinary tract infection in Turkey. A total of 120 E. coli strains during 2017, 2018, and 2019 (40 patients per year) were examined for antibiotic susceptibility patterns by disc diffusion method, for ESBL genes using PCR and sequencing and for molecular typing by pulsed-field gel electrophoresis (PFGE) method. The isolates were evaluated for their sensitivity to 21 different antibiotics. Four different antimicrobial resistance patterns were determined according to antibiotic susceptibility status of the isolates. The β-lactamase genes detected in the isolates were CTX-M-15 + OXA-1 (n= 14), CTX-M-15 (n= 24), TEM-1 + CTX-M-15 (n= 52), TEM-1 + SHV-12 (n=6), SHV-12 1 (n= 6), TEM-1 + CTX-M-1 (n= 6), TEM-1 + CTX-M-16 (n= 6) and TEM-1 + CTX-M-9 (n= 6). The CTX-M-15 was the most prevalent ESBL enzyme in the isolates. As a result of PFGE analysis performed by XbaI enzyme restriction process, one major PFGE profile and three main groups (Group I-II-III) were observed. While antibiotic resistance profiles of the strains showed four groups (RI-RII-RIII-RIV), PFGE band profiles showed a major group (90% similarity ratio). High ESBL production and decreased susceptibility to broad-spectrum cephalosporins were observed in E. coli strains. In addition, PFGE analysis showed high clonal similarity among E. coli isolates.

Özet

Bu çalışmada Türkiye’de idrar yolu enfeksiyonu bulunan hastalardan alınan idrar örneklerinden izole edilmiş olan genişlemiş spektrumlu β-laktamaz (GSBL) pozitif E. coli suşlarının antibiyotik duyarlılık paternlerinin (fenotipik), GSBL genlerinin ve genotipik profillerinin belirlenmesi amaçlandı. Çalışmada 2017, 2018 ve 2019 yıllarında ve her yıl 40 hastadan olmak üzere, toplam 120 adet E. coli suşunun disk difüzyon yöntemi ile antibiyotik duyarlılıkları, PCR ve sekanslama ile GSBL genleri, pulsed-field jel elektroforez (PFGE) yöntemi ile moleküler tipleri belirlendi. Numunelerden elde edilen izolatların 21 farklı antibiyotiğe karşı duyarlılığı değerlendirildi. İzolatların antibiyotik duyarlılık durumlarına göre, değerlendirmede dört farklı antimikrobiyal direnç paterni tespit edildi. İzolatlarda β-laktamaz genleri olarak CTX-M-15 + OXA-1 (n= 14), CTX-M-15 (n= 24), TEM-1 + CTX-M-15 (n= 52), TEM-1 + SHV-12 (n= 6), SHV-12 1 (n= 6), TEM-1 + CTX-M-1 (n= 6), TEM-1 + CTX-M-16 (n= 6) ve TEM-1 + CTX-M-9 (n= 6) tespit edildi. CTX-M-15 izolatlarda en yaygın görülen GSBL enzim tipi olarak belirlendi. PFGE analizi sonucunda, bir majör PFGE profili ve üç ana grup (Grup I-II-III) gözlendi. Suşların antibiyotik direnç profilleri, dört grupta (RI-RII-RIII-RIV) bulunurken, PFGE bant profilleri ise bir majör grup içinde bulunduğu (% 90 benzerlik oranı) belirlendi. Numunelerde E. coli yüksek GSBL üretimi ve geniş spektrumlu sefalosporinlere karşı azalan bir duyarlılık gözlendi. Ayrıca, PFGE analizi ile bu izolatların yüksek klonal benzerliğe sahip olduğu da gösterildi.

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Cite This Article

ALTINTAŞ, L., TUTUN, H., KARAGÖZ, A., KOÇAK, N. (2022). Determination of antibiotic susceptibility, ESBL genes and pulsed-field gel electrophoresis profiles of extended-spectrum β-lactamase-containing Escherichia coli isolates. Ankara Üniversitesi Veteriner Fakültesi Dergisi, Cilt: 66 - Sayı: 4, 407–416. https://ajindex.com/articles/444515

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