Extended-spectrum β-lactamases (ESBLs) are the main cause of resistance to the third and forth-generation cephalosporins in Enterobacteriaceae which are mediated by plasmids and can hydrolyze oxyiminoaminothiazolyl cephalosporins and mono- bactams.1 Most Extended-spectrum β-lactamases (ESBLs) are the main cause of resistance to the third and forth-generation cephalosporins in Enterobacteriaceae which are mediated by plasmids and can hydrolyze oxyiminoaminothiazolyl cephalosporins and mono-bactams.1 Most