Risk Characterization of Antibiotic Resistance in Bacteria Isolated from Backyard, Organic, and Regular Commercial Eggs

This study was conducted to assess the risk due to antimicrobial-resistant strains of Salmonella spp., Listeria monocytogenes, and Escherichia coli isolated from the eggshell and the contents of eggs bought in markets in Valencia (Spain). Thirty-four samples from three different production styles we...

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Bibliographic Details
Published in:Journal of food protection 2019-03, Vol.82 (3), p.422-428
Main Authors: Fenollar, Alejandro, Doménech, Eva, Ferrús, María Antonia, Jiménez-Belenguer, Ana
Format: Article
Language:English
Subjects:
Animals
Anti-Bacterial Agents - pharmacology
Drug Resistance, Bacterial
Drug Resistance, Multiple, Bacterial
Eggs - microbiology
Escherichia coli - drug effects
Escherichia coli - isolation & purification
Microbial Sensitivity Tests
Salmonella - drug effects
Salmonella - isolation & purification
Spain
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Summary:This study was conducted to assess the risk due to antimicrobial-resistant strains of Salmonella spp., Listeria monocytogenes, and Escherichia coli isolated from the eggshell and the contents of eggs bought in markets in Valencia (Spain). Thirty-four samples from three different production styles were analyzed: standard ( n = 34), organic ( n = 16), and backyard ( n = 10) eggs. L. monocytogenes was not isolated in any style of production. Only one strain of Salmonella was isolated from standard production, which was resistant to ciprofloxacin and amoxicillin. E. coli strains were resistant in 22% of the isolates from organic production, 12.25% from standard production, and 11.23% from backyard production. In all cases, the highest resistance was observed for amoxicillin-clavulanate. None of the isolates from standard and backyard eggs were resistant to chloramphenicol, ciprofloxacin, gentamycin, and streptomycin, while only ceftriaxone was found to be effective against all E. coli isolates from organic eggs. β-Lactamase genes bla , bla , and bla and the resistance genes for tetracycline tetA, tetB, and tetC were tested. The most commonly detected antimicrobial resistance genes among the E. coli isolates were tetA (49.30%), bla (47.89%), and tetB (36.62%). Overall, a maximum public health risk is associated with β-lactam antibiotics.
ISSN:0362-028X
1944-9097
DOI:10.4315/0362-028X.JFP-18-355