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KMID : 0380620160480040323
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Korean Journal of Food Science and Technology
2016 Volume.48 No. 4 p.323 ~ p.328
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Evaluation of enrichment broth and selective media for the detection of non-O157 enterohemorrhagic Escherichia coli
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Lee Da-Yeon
Kim Hee-eon
Seo Dong-Won
Cho Yong-Sun
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Abstract
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In this study, specific and rapid enrichment and growth conditions for the most important, classic non-O157 enterohemorrhagic Escherichia coli (EHEC) serogroups were assessed. Three enrichment broth types, namely, EC medium with MUG broth, BRILA broth, and mTSB broth with novobiocin, were compared to identify the optimum enrichment broth for EHEC isolation. Four kinds of selective media, namely, ENDO agar, Chromocult agar, TBX agar, and CHROMagarTM STEC medium, were compared to identify the optimum one for non-O157 EHEC isolation. The results suggested that incubation in EC medium with MUG broth at 42°C for 20 h is optimum for the enrichment of non-O157 EHEC. TBX agar was identified to have the highest specificity among the tested media. Consequently, a combination of complementary selective media according to serotype must be considered for comprehensive isolation of specific EHEC.
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KEYWORD
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enterohemorrhagic Escherichia coli, enrichment broth, selective media, evaluation
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