The Survey of Genes Encoding Beta-Lactamases, in Escherichia Coli Resistant to Beta-Lactam and Non-Beta-Lactam Antibiotics

سال انتشار: 1389
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 162

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شناسه ملی سند علمی:

JR_IJBMS-13-1_007

تاریخ نمایه سازی: 30 مهر 1400

چکیده مقاله:

Objective(s) Resistance to the new generation of cephalosporins which is mediated by Extended-Spectrum beta-lactamases (ESBLs) has been found among Escherichia coli isolates throughout the world. These resistance genes and their producers, the micro-organisms carrying beta-lactamases, are responsible for serious clinical and therapeutic problems among inpatients and it is necessary to pay more attention to detection of ESBLs producing organisms. Materiasl and Methods Collectively ۲۶۰ isolates of E. coli were obtained from ۶ hospitals in Tehran (Iran) during April-۲۰۰۶ to April-۲۰۰۷. The antibiotic susceptibility patterns of isolates were determined by disk diffusion method. phenotypic confirmatory test (PCT) was carried out for screening of ESBLs. Microbroth dilution assay was used to determine the minimum inhibitory concentration (MIC) of ceftazidime. Isolates showing MIC>۲ pg/ml were subjected to polymerase chain reaction (PCR) targeting blaTEM, blaSHV, blaCTX and blaPER genes. Results The PCT showed that ۴۸.۰۸% of isolates are ESBL producers (۱۲۵ of ۲۶۰). The majority of cefotaxime resistant (۹۰.۸%) and ceftazidime resistant (۹۲.۵%) isolates were ESBL producers. The obtained results by PCR revealed that ۵.۷۷% (n=۱۵ of ۲۶۰) and ۲۴.۲۳ (n=۶۳) of isolates can produce SHV and TEM type enzymes respectively. blaCTX was detected in ۲۰.۳۸% of isolates (n=۵۳) and none of them could produce blaPER type beta-lactamases. Conclusion The results of our study showed that the ESBL genes have high prevalence among clinical isolates of E. coli. Such high dissemination of ESBLs is a serious problem for public health and therefore, it's necessary to seek a program for monitoring ESBLs in hospitals.

نویسندگان

Fereshteh Shahcheraghi

Department of Microbiology, Pasteur Institute of Iran, Tehran, Ira

Siavash Nasiri

Department of Microbiology, Pasteur Institute of Iran, Tehran, Ira

Hanieh Noveiri

Department of Microbiology, Pasteur Institute of Iran, Tehran, Ira

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