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초록

The objective of this investigation was to determine the prevalence and characteristics
of an extended-spectrum--lactamase (ESBL)-producing pathogenic strain of Escherichia
coli that caused a foodborne outbreak in August 2017 in Seoul, Korea. Of the 134
samples (117 rectal swabs and 17 environmental swabs), 24 enterotoxigenic E. coli (ETEC),
20 enteroaggregative E. coli (EAEC), and 4 enteropathogenic E. coli (EPEC) were isolated
and characterized. Antimicrobial susceptibility testing was performed using Vitek 2
System. Among the 48 pathogenic isolates, 29 were identified as ESBL-producing strains
of E. coli . The ESBL genotypes were determined by PCR using the blaTEM, blaSHV,
and blaCTX-M gene sequences. The ESBL gene sequencing results showed that all 29
ESBL-producing E. coli isolates produced CTX-M-type ESBLs, including CTX-M-15
(ETEC, n=24) and CTX-M-14 (EAEC, n=5). In PFGE analysis, all but one ETEC strains
showed the same patterns. All ESBL-producing EAEC strains also