Journal article
Extended-spectrum beta-lactamases, food, and cephalosporin use in food animals
Fecal Escherichia coli isolates showing a phenotype of reduced susceptibility or resistance to extended-spectrum cephalosporins are common among pigs in Spain. The aim of this study was to describe the main beta-lactam resistance mechanisms carried by these strains and their distribution at farm-level.
Twenty-nine E. coli isolates showing reduced susceptibility or resistance to extended-spectrum cephalosporins were collected from a sampling frame of 80 pig farms distributed over 13 Spanish provinces. The survey was carried out at the slaughterhouse level in 2004. Of the 29 isolates, 21 (72%) met the criteria for a positive phenotypic confirmatory test for extended-spectrum beta-lactamases (ESBL).
The following ESBLs were detected: SHV-12 (12 isolates, 41%), CTX-M-1 (three isolates, 10%), CTX-M-9 (three isolates, 10%), and CTX-M-14 (three isolates, 10%). The remaining eight isolates (28%) were phenotypically non-ESBL, with seven of them (24%) showing mutations on the chromosomal ampC gene promoter at positions -42 (C-->T), -18 (G-->A), -1 (C-->T), and +58 (C-->T).
A multiplex PCR for detection of plasmidic class C beta-lactamases was negative for all isolates. Different ESBLs and other mechanisms linked to extended-spectrum cephalosporin resistance are widely distributed among fecal E. coli from slaughter pigs in Spain.
Language: | English |
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Year: | 2007 |
Pages: | 1391-1392 |
ISSN: | 15376591 , 10584838 , 15322661 and 00345288 |
Types: | Journal article |
DOI: | 10.1016/j.rvsc.2009.05.021 |
ORCIDs: | Aarestrup, Frank Møller |