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Molecular epidemiology of sequence type 33 of Shiga toxin-producing Escherichia coli O91:H14 isolates from human patients and retail meats in Korea
Jun Bong Lee1, Se-Kye Kim1, Seon Mi Wi1, Young-Jae Cho1, Tae-Wook Hahn1, Jae-yon Yu2, Sungsun Kim2, Sahyun Hong3, Jonghyun Kim2,*, Jang Won Yoon1,*
1College of Veterinary Medicine & Institute of Veterinary Science, Kangwon National University, Chuncheon, Gangwon 24341, Republic of Korea
2Division of Bacterial Disease Research, Center for Infectious Diseases Research, Korea National Institute of Health, Centers for Disease Control and Prevention, Cheongju-si, Chungcheongbuk-do, 28159, Republic of Korea
3Division of Bacterial Disease, Center for Laboratory Control of infectious Diseases, Center for Disease Control and Prevention, Cheongju-si, Chungcheongbuk-do, 28159, Republic of Korea
Correspondence to: Tel: +82-33-250-8791; Fax: +82-33-259-5625; E-mails: jwy706@kangwon.ac.kr (JW Yoon), micro487@hanmail.net (J Kim)
Received: August 31, 2018; Revised: October 9, 2018; Accepted: October 18, 2018; Published online: November 26, 2018.
Abstract
Sequence type (ST) 33 of STEC O91:H14 has been proposed as a potential domestic clone of Shiga toxin-producing Escherichia coli (STEC) in Korea because of its high prevalence among human patients with mild diarrhea or asymptomatic carriers. Here, the clonal diversity of 17 STEC O91:H14 isolates of ST33 during 2003-2014 was analyzed by pulsed-field gel electrophoresis, including 14 isolates from human patients and 3 from retail meats. Their virulence characteristics, acid resistance, and antimicrobial susceptibility were also determined. Our results showed that all the isolates were clustered mainly into three different pulsotypes and likely low pathogenic with no antimicrobial resistance.
Keywords: Shiga toxin, Escherichia coli, sequence type 33, O91:H14, Korea


© 2018 The Korean Society of Veterinary Science.