Title:Clonal Relatedness, Phylotyping and Antimicrobial Susceptibility of Extended- spectrum-beta-lactamase Producing Uropathogenic Escherichia coli Isolates from Outpatients and Inpatients
VOLUME: 20 ISSUE: 5
Author(s):Negar Azimzadeh, Abdollah Derakhshandeh, Mohammad Motamedifar* and Zahra Naziri
Affiliation: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
Keywords:PFGE, ESBLs, inpatients, outpatients, Escherichia coli, urinary tract infections
Abstract:
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 to E. coli isolated from non-hospitalized and hospitalized
patients (153 outpatients and 147 inpatients ) was 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 prevalence of ESBL-producing E. coli was shown to be 46.4% and 49% in the 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
group D was the dominant group in both the 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 the outpatient
isolates and also between inpatient and outpatient isolates was less than 80% (75% and 66%, respectively).
Conclusion: The results showed extreme genomic diversity among the ESBL-producing E. coli
isolates in terms of the community and multiclonal dissemination of ESBL-producing E. coli isolated
from hospital units.
