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Original Article
- A Comparison of Subtyping Methods for Differentiating
Salmonella enterica Serovar Enteritidis Isolates Obtained from Food and Human Sources - Ji-Yeon Hyeon, Jung-Whan Chon, Jun-Ho Park, Moo-Sang Kim, Young-Hee Oh, In-Soo Choi, Kun-Ho Seo
- Osong Public Health Res Perspect. 2013;4(1):27-33. Published online February 28, 2013
- DOI: https://doi.org/10.1016/j.phrp.2012.12.005
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Abstract
PDF - Purpose:
To evaluate the abilities of these subtyping methods, we distinguished Salmonella Enteritidis (S. Enteritidis) isolated from food products and human clinical samples between 2009 and 2010 in Seoul using five subtyping methods.
Methods
We determined the subtypes of 20 S. Enteritidis isolates from food and human sources using phage typing, antimicrobial susceptibility, pulsed-field gel electrophoresis (PFGE), repetitive sequence-based PCR (rep-PCR), and multi-locus sequence typing (MLST).
Results
A total of 20 tested isolates were differentiated into six antimicrobial susceptibility patterns, three different phage types, four different PFGE profiles, seven rep-PCR patterns, and one MLST type. Food isolates were considerably more susceptible to antibiotics than human isolates. We were best able to discriminate among S. Enteritidis isolates using rep-PCR, and obtained the highest Simpson’s diversity index of 0.82, whereas other methods produced indices that were less than 0.71. PFGE pattern appeared to be more related to antimicrobial resistance and phage types of S. Enteritidis isolates than rep-PCR. MLST revealed identical alleles in all isolates at all seven loci examined, indicating no resolution.
Conclusion
The results of this study suggest that rep-PCR provided the best discriminatory power for phenotypically similar S. Enteritidis isolates of food and human origins, whereas the discriminatory ability of MLST may be problematic because of the high sequence conservation of the targeted genes. -
Citations
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