Negar Azimzadeh, Abdollah Derakhshandeh, Mohammad Motamedifar* and Zahra Naziri Pages 1 - 9 ( 9 )
Objectives: Antibiotic resistance, phylogenetic groups and Pulsed-Field Gel Electrophoresis (PFGE) patterns were evaluated in urinary tract infection (UTI) Escherichia coli (E. coli) isolates from outpatients and inpatients.
Methods: In this study, antibiotic resistance of 153 outpatients and 147 inpatients E. coli isolated from non-hospitalized and hospitalized patients were evaluated in Shiraz County, Iran. Phylogenetic groups and Pulse Field Gel Electrophoresis (PFGE) patterns of 143 ESBLs producing E. coli were also assessed.
Results: The incidence of ESBL-producing E. coli was shown to be 46.4% and 49% in outpatient and inpatient UTI E. coli isolates, respectively. Most ESBL producers were detected on patients hospitalized in clinical surgery units (66.7%) and intensive-Care units (62.5%). Phylogenetic groups D were the dominant group in both outpatient and inpatient isolates (67.6% and 61.1%, respectively) and also in internal, clinical surgery and ICU units. PFGE results showed more relatedness (>80% similarity) among inpatient isolates. PFGE analysis of 49 ESBL-producing inpatient E.coli in hospital units revealed 17 different pulsotypes, consisting of 11 clones and 6 single patterns. There were no clonal patterns in outpatient isolates, and similarity among outpatient isolates and also between inpatient and outpatient isolates were less than 80% (75% and 66%, respectively).
Conclusions: The results showed extreme genomic diversity among the ESBL-producing E. coli isolated from community and multiclonal dissemination of ESBL-producing E. coli isolated from hospital units.
PFGE, ESBLs, inpatients, outpatients, Escherichia coli, Urinary tract infections
Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz, Department of Bacteriology and Virology, Shiraz University of Medical Science, Shiraz, Department of Pathobiology, School of Veterinary Medicine, Shiraz University, Shiraz