Ana Sayfa | Dergi Hakkında | Yayın Kurulu | Telif Hakkı Devir Formu | İçindekiler | Arşiv | Yayın Arama | Yazarlara Bilgi | İletişim  
2021, Cilt 51, Sayı 1, Sayfa(lar) 023-032
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Antimicrobial Susceptibility of Bacteroides fragilis Group Isolates to Clindamycin, Tetracycline and Tigecycline, and Their Possession of tet and ermF Genes, which are Responsible for Resistance
Bermal Tekeş1, Semra Eminoğlu1, Elvan Sayın2, Nurver Ülger Toprak1
1Marmara Üniversitesi Tıp Fakültesi, Tıbbi Mikrobiyoloji Anabilim Dalı, İstanbul, Türkiye
2Marmara Üniversitesi Pendik Eğitim ve Araştırma Hastanesi, Mikrobiyoloji Laboratuvarı, İstanbul, Türkiye
Keywords: Bacteroides, clindamycin, tetracyclin, tigecycline, tet gene, ermF gene

Objective: We aimed to determine the resistance of Bacteroides fragilis group (BFG) bacteria to clindamycin, tetracycline and tigecycline and establish the distribution of related resistance genes.

Method: In total 82 BFG strains, isolated from different clinical samples between January 2017 and December 2018, were identified by MALDI-TOF MS. Their antimicrobial sensitivities to were determined using agar dilution methodology (CLSI; M11-A7). The tetM, tetQ, tetX, tetX1, tet36, and ermF genes were investigated by PCR.

Results: Eighty-two strains of BFG bacteria, isolated from intra-abdominal abscess (n=36), tissue biopsy (n=16), blood (n=14) and other sterile body fluids (n=12), were identified as Bacteroides fragilis (n=48), Bacteroides thetaiotaomicron (n=17), Bacteroides vulgatus (n=5), Bacteroides ovatus (n=4), Bacteroides caccae (n=1), Bacteroides uniformis (n=1) and Parabacteroides distasonis (n=6). The resistance rates to clindamycin, tetracycline and tigecycline were 54.9%, 84.1%, 4.9%, respectively. Non-B. fragilis isolates were more resistant than B. fragilis strains. In total, 57.3% of the isolates were ermF gene positive, while B. thetaiotaomicron had the highest rate (70.6%). The tet gene positivity ranged from 18.8% to 66.7% among species. The tetQ gene positivity was higher than other tet genes. The 92.7% of the isolates were resistant to at least one antibiotic, while 94% had at least one resistance gene.

Conclusion: This study provided data on antimicrobial resistance of our BFG isolates to clindamycin, tetracycline and tigecycline and the related resistance genes. However, our information obtained could also be a starting point for further investigation of the antibiotic resistance mechanisms of Bacteroides species, as well as, resistance transfer among BFG isolates and other bacteria.


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Ana Sayfa | Dergi Hakkında | Yayın Kurulu | Telif Hakkı Devir Formu | İçindekiler | Arşiv | Yayın Arama | Yazarlara Bilgi | İletişim