Distribution of ESBL producing Uropathogenic Escherichia coli and carriage of selected [beta]-lactamase genes in Hospital and community isolates in west of Iran

Background and Objective: For many years, extended-spectrum-beta-lactamase (ESBL)-producing bacteria were problems mainly located in medical facilities. Within the last decade, however, ESBL-producing bacteria have started spreading into the community and the hospital. The aims of this study were to detect ESBL-producing uropathogenic Escherichia coli (UPEC), susceptibility to antibiotics, and β-lactamase genes. Materials and Methods: Two hundred bacterial isolates were collected from inpatients and outpatients in the west of Iran from December 2011 to February 2013. All isolates were identified by conventional bacteriological tests. Antimicrobial susceptibility and interpretation were assessed by disk diffusion. ESBL-producing E. coli isolates were tested by polymerase chain reaction (PCR) assay for bla TEM , blaSHV , blaCTX-M , blaOXA-I , and blaOXA-II genes. Results: Of 200 UPEC, 22% (n = 44) were ESBL-producing; 0% showed the least resistance to imipenem, and 97.7% showed high resistance to carbenicillin and ampicillin. The ESBLs CTX-M, SHV, TEM, OXAI, and OXAII were detected in 93.3%, 68.2%, 43.2%, 31.8%, and 22.7% of isolates respectively. Conclusion: A prevalence of ESBL-producing UPEC was observed in outpatients and inpatients; the high levels of resistance to different antibiotics show that treatment options are limited and that infection control measures remain of high importance.