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Mansouri, Shahla; Kalantar Neyestanaki, Davood; Shokoohi, Mostafa; Halimi, Shahnaz; Beigverdi, Reza; Rezagholezadeh, Fereshteh; Hashemi, Ali
Jundishapur journal of microbiology, 02/2014, Volume: 7, Issue: 2Journal Article
Extended spectrum β-lactamases (ESBLs) and AmpC β-lactamases enzyme are major sources of resistance to β-lactam antibiotics especially in Enterobacteriaceae such as Escherichia coli and Klebsiella pneumoniae. Increasing frequency of the co-existence of ESBLs with AmpC-β-lactamases in bacteria is a serious threat for treating bacterial infections. The aim of this study was to determine the presence of AmpC and CTX-M types of β-lactamases in clinical isolates of E. coli and K. pneumoniae producing ESBLs. Resistance to different antibiotics was determined using the standard disk diffusion method. ESBLs, MBLs and AmpC-β-lactamases were detected by the combination double disk test (CDDT) method and polymerase chain reaction (PCR) was used to determine bla CTX -M genes in the ESBLs and AmpC positive isolates. The prevalence of ESBLs and AmpC-β-lactamase producer isolates was 181 (43.8%) and 133 (37.2%), respectively. The prevalence of bla CTX -M among isolates was 61 (14.7%). Outbreak of isolates co-expressing AmpC-β-lactamases and ESBLs can cause serious problems in the future, regarding the treatment of infections caused by these common enteric pathogens.
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