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SCI Article

Comparison of the isolation rates and characteristics of Salmonella isolated from antibiotic-free an
Author
Kim, H. (Dept Food & Nutr); Om, A. -S. (Dept Food & Nutr);
Corresponding Author Info
Seo, KH (reprint author), Konkuk Univ, Coll Vet Med, Ctr Hlth 1, Seoul, South Korea.
E-mail
bracstu3@konkuk.ac.kr
Document Type
Article
Source
POULTRY SCIENCE Volume:96 Issue:8 Pages:2831-2838 Published:2017
Times Cited
0
External Information
http://dx.doi.org/10.3382/ps/pex055
Abstract
Salmonella contamination in chicken samples can cause major health problems in humans. However, not only the effects of antibiotic treatment during growth but also the impacts of the poultry slaughter line on the prevalence of Salmonellae in final chicken meat sold to consumers are unknown. In this study, we compared the isolation rates and antimicrobial resistance of Salmonellae among antibiotic-free, conventional, conventional Korean native retail chicken meat samples, and clonal divergence of Salmonella isolates by multilocus sequence typing. In addition, the distribution of extended-spectrum beta-lactamase (ESBL) genes in ESBL-producing Salmonella isolates was analyzed. A total of 72 retail chicken meat samples (n = 24 antibiotic-free broiler [AFB] chickens, n = 24 conventional broiler [CB] chickens, and n = 24 conventional Korean native [CK] chickens) was collected from local retail markets in Seoul, South Korea. The isolation rates of Salmonellae were 66.6% in AFB chickens, 45.8% in CB chickens, and 25% in CK chickens. By analyzing the minimum inhibitory concentrations of beta-lactam antibiotics with the disc-diffusion test, we found that 81.2% of Salmonella isolates from AFB chickens, 63.6% of isolates from CB chickens, and 50% of isolates from CK chickens were ESBL producers; all ESBL-positive isolates had the CTX-M-15 genotype. Interestingly, all ESBL-producing Salmonellae were revealed as ST16 by multilocus sequence typing and had the genetic platform of bla(CTX-M) gene (IS26-ISEcp1-bla(CTX-M-15)-IS903), which was first reported in Salmonellae around the world. The Salmonella ST33 strain (S. Hadar) isolated in this study has never been reported in South Korea. In conclusion, our findings showed that antibiotic-free retail chicken meat products were also largely contaminated with ESBL-producing Salmonellae and that their ESBL genes and genetic platforms were the same as those isolated from conventional retail chicken meat products.
Web of Science Categories
Agriculture, Dairy & Animal Science
Funding
Konkuk University
Language
English
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