NDLI: Effect of competitive exclusion in reducing the occurrence of Escherichia coli producing extended-spectrum ß-lactamases in the ceca of broiler chicks.

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Effect of competitive exclusion in reducing the occurrence of Escherichia coli producing extended-spectrum ß-lactamases in the ceca of broiler chicks.

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Effect of competitive exclusion in reducing the occurrence of Escherichia coli producing extended-spectrum ß-lactamases in the ceca of broiler chicks.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Nuotio, L. Schneitz, C. Nilsson, O.
Spatial Coverage	Sweden Finland
Description	Country affiliation: Finland Author Affiliation: Nuotio L ( Finnish Food Safety Authority Evira, Mustialankatu 3, FI-00790 Helsinki, Finland. lasse.nuotio@evira.fi)
Abstract	Extended-spectrum ß-lactamases (ESBL) and class C serine ß-lactamases (pAmpC) able to hydrolyze third-generation cephalosporins are a recognized threat to the efficacy of these drugs in treating serious infections. Broiler chicks are a known source of Escherichia coli harboring genes for these enzymes. Competitive exclusion (CE) has been used for decades in Finland to prevent the colonization of broiler ceca by Salmonella, but has not been widely used in Sweden. The markedly different prevalences of ESBL- or pAmpC-producing E. coli at slaughter in broilers produced in the 2 countries suggest a potential role for CE. The present study was undertaken to determine the efficacy of a commercial CE product in reducing the colonization of broiler ceca by ESBL- or pAmpC-producing E. coli. The challenge organisms were isolated from healthy broilers in Sweden. Each E. coli strain (1 ESBL and 2 pAmpC types) was subjected to 4 replicate trials. In each trial, a group of 20 newly hatched Ross breed chicks were treated by gavage with the CE product, whereas another group of 20 was left untreated. The next day, all 40 chicks were inoculated by gavage with the E. coli strain. The chicks were reared in cardboard boxes and received feed and water ad libitum. After a week the chicks were asphyxiated with CO(2), and their ceca removed and examined for the presence of the E. coli strains. The median and quartiles of the challenge E. coli estimates in the groups were determined, and the treated and control groups were compared with the Wilcoxon 2-sample test. In each trial, a substantial and statistically significant or highly significant reduction was observed in the colonization of the ceca of CE-treated chicks by E. coli strains, compared with that of untreated control. Referring to an arbitrary criterion for high shedders presented in the literature, it was concluded that at least for the ESBL E. coli, the results were also of epidemiological relevance.
File Format	HTM / HTML
ISSN	00325791
e-ISSN	15253171
Journal	Poultry Science
Issue Number	1
Volume Number	92
Language	English
Publisher	Oxford University Press
Publisher Date	2013-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Open
Subject Keyword	Discipline Veterinary Medicine Cecum Microbiology Escherichia Coli Enzymology Metabolism Animals Genetics Finland Gene Expression Regulation, Bacterial Physiology Gene Expression Regulation, Enzymologic Sweden
Content Type	Text
Resource Type	Article
Subject	Medicine Animal Science and Zoology

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