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Fakih I, Thiry D, Duprez JN, Saulmont M, Iguchi A, Piérard D, Jouant L, Daube G, Ogura Y, Hayashi T, Taminiau B, Mainil JG. Identification of Shiga toxin-producing (STEC) and enteropathogenic (EPEC) Escherichia coli in diarrhoeic calves and comparative genomics of O5 bovine and human STEC. Vet Microbiol 2016; 202:16-22. [PMID: 26923249 DOI: 10.1016/j.vetmic.2016.02.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 02/17/2016] [Accepted: 02/22/2016] [Indexed: 01/22/2023]
Abstract
Escherichia coli producing Shiga toxins (Stx) and the attaching-effacing (AE) lesion (AE-STEC) are responsible for (bloody) diarrhoea in humans and calves while the enteropathogenic E. coli (EPEC) producing the AE lesion only cause non-bloody diarrhoea in all mammals. The purpose of this study was (i) to identify the pathotypes of enterohaemolysin-producing E. coli isolated between 2009 and 2013 on EHLY agar from less than 2 month-old diarrhoeic calves with a triplex PCR targeting the stx1, stx2, eae virulence genes; (ii) to serotype the positive isolates with PCR targeting the genes coding for ten most frequent and pathogenic human and calf STEC O serogroups; and (iii) to compare the MLSTypes and virulotypes of calf and human O5 AE-STEC after Whole Genome Sequencing using two server databases (www.genomicepidemiology.org). Of 233 isolates, 206 were triplex PCR-positive: 119 AE-STEC (58%), 78 EPEC (38%) and 9 STEC (4%); and the stx1+eae+ AE-STEC (49.5%) were the most frequent. Of them, 120 isolates (84% of AE-STEC, 23% of EPEC, 22% of STEC) tested positive with one O serogroup PCR: 57 for O26 (47.5%), 36 for O111 (30%), 10 for O103 (8%) and 8 for O5 (7%) serogroups. The analysis of the draft sequences of 15 O5 AE-STEC could not identify any difference correlated to the host. As a conclusion, (i) the AE-STEC associated with diarrhoea in young calves still belong to the same serogroups as previously (O5, O26, O111) but the O103 serogroup may be emerging, (ii) the O5 AE-STEC from calves and humans are genetically similar.
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Affiliation(s)
- I Fakih
- Bacteriology, Infectious Disease Department, Institute for Fundamental and Applied Research in Animal Health (FARAH) and Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - D Thiry
- Bacteriology, Infectious Disease Department, Institute for Fundamental and Applied Research in Animal Health (FARAH) and Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - J-N Duprez
- Bacteriology, Infectious Disease Department, Institute for Fundamental and Applied Research in Animal Health (FARAH) and Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - M Saulmont
- Association Régionale de Santé et d'Identification Animale (ARSIA), 5590 Ciney, Belgium
| | - A Iguchi
- Department of Animal and Grassland Sciences, Faculty of Agriculture, University of Miyazaki, Miyazaki 889-1692, Japan
| | - D Piérard
- Dienst Microbiologie en Ziekenhuishygiëne, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, 1090 Brussels, Belgium
| | - L Jouant
- Bacteriology, Infectious Disease Department, Institute for Fundamental and Applied Research in Animal Health (FARAH) and Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - G Daube
- Microbiology, Food Science Department, Institute for Fundamental and Applied Research in Animal Health (FARAH) and Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - Y Ogura
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - T Hayashi
- Department of Bacteriology, Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - B Taminiau
- Microbiology, Food Science Department, Institute for Fundamental and Applied Research in Animal Health (FARAH) and Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium
| | - J G Mainil
- Bacteriology, Infectious Disease Department, Institute for Fundamental and Applied Research in Animal Health (FARAH) and Faculty of Veterinary Medicine, University of Liège, 4000 Liège, Belgium.
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