Publication
Title
Diversity of extended-spectrum β-lactamases and class C β-lactamases among cloacal Escherichia coli isolates in Belgian broiler farms
Author
Abstract
A total of 295 ceftiofur-resistant Escherichia coli isolates were obtained from 489 cloacal samples collected at five different Belgian broiler farms with the aim to evaluate the diversity of this resistance at the farm level. Strains were examined for resistance against beta-lactam antibiotics and other antimicrobial agents by using disk diffusion tests. Three different beta-lactam resistance phenotypes suggested the presence of an extended-spectrum beta-lactamase (ESBL), a class C beta-lactamase, or the combination of an ESBL with a class C beta-lactamase. Seventy-six percent of these isolates also showed acquired resistance to other antimicrobial agents. After genotyping by repetitive extragenic palindromic-PCR, 51 unrelated E. coli strains were selected for further analyses. Isoelectric focusing and sequencing of the amplicons obtained in PCRs for the detection of genes encoding broad-spectrum beta-lactamase enzymes revealed the following ESBLs: TEM-52 (13.2%), TEM-106 (2%), CTX-M-1 (27.4%), CTX-M-2 (7.8%), CTX-M-14 (5.9%), and CTX-M-15 (2%). The only plasmidic AmpC beta-lactamase found in this study was the CMY-2 enzyme (49%). Mutations in the promoter and attenuator regions of the chromosomal ampC gene were found only in association with bla(CMY-2) genes and ESBL genes. The combination of an ESBL (CTX-M-1) with a plasmidic AmpC beta-lactamase (CW-2) was found in 7.8% of the isolates. These data show that ceftiofur-resistant E. coli strains are often present in cloacal samples of broilers at the farm level in Belgium. The diversity of broad-spectrum beta-lactamases among these isolates is high, and they may act as a reservoir of ESBL and ampC genes.
Language
English
Source (journal)
Antimicrobial agents and chemotherapy. - Washington, D.C., 1972, currens
Publication
Washington, D.C. : American Society for Microbiology , 2008
ISSN
0066-4804
DOI
10.1128/AAC.01285-07
Volume/pages
52 :4 (2008) , p. 1238-1243
ISI
000254881900005
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Publication type
Subject
External links
Web of Science
Record
Identifier
Creation 31.01.2017
Last edited 17.02.2023
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