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Serotypes, virulence genes, and intimin types of Shiga toxin-producing Escherichia coli (STEC) and enteropathogenic E. coli (EPEC) isolated from calves in São Paulo, Brazil.
Int J Food Microbiol. 2007 Apr 20; 115(3):297-306.IJ

Abstract

Shiga toxin-producing Escherichia coli (STEC), is the most important recently emerged group of foodborne pathogens. Ruminants, especially cattle, have been implicated as a principal reservoir of STEC, undercooked ground beef and raw milk being the major vehicles of foodborne outbreaks. Enteropathogenic E. coli (EPEC) strains are defined as eae-harboring diarrheagenic E. coli that possess the ability to form A/E lesions on intestinal cells and that do not possess Shiga toxin genes. In order to determine the occurrence, serotypes and virulence markers of STEC and EPEC strains, 546 fecal samples from 264 diarrheic calves and 282 healthy calves in beef farms in São Paulo, Brazil, were screened by PCR. STEC and EPEC were isolated in 10% and 2.7% of the 546 animals, respectively. Although IMS test was used, the STEC serotype O157:H7 was not detected. The most frequent serotypes among STEC strains were O7:H10, O22:H16, O111:H(-), O119:H(-) and O174:H21, whereas O26:H11, O123:H11 and O177:H11 were the most prevalent among EPEC strains. In this study, serotypes not previously reported were found among STEC strains: O7:H7, O7:H10, O48:H7, O111:H19, O123:H2, O132:H51, O173:H(-), and O175:H49. The eae gene was detected in 25% of the STEC and 100% of EPEC strains. The intimin type theta/gamma2 was the most frequent among STEC, whereas the intimin beta1 was the most frequent intimin type among EPEC strains. To our knowledge, this is the first report of the occurrence of the new intimin muB in one strain of animal origin. This new intimin was detected in one atypical EPEC strain of serotype O123:H? isolated from diarrheic cattle. The enterohemolysin (ehxA) was detected in 51% of the STEC and 80% of the EPEC strains, whereas STEC autoagglutinating adhesin (saa) virulence gene was detected only in those STEC strains negative for eae gene. All 15 bovine EPEC strains isolated in this study were negative for both eaf and bfp genes. Our data shows that in Brazil cattle are not only a reservoir of STEC and atypical EPEC, but also a potential source of infection in humans, since the important STEC serotypes previously described and associated with severe diseases in humans, such as O111:H(-), O113:H21, O118:H16, and O174:H21 were isolated.

Authors+Show Affiliations

Departamento de Microbiologia e Imunologia, Instituto de Biologia, Universidade de Campinas, 13081-970, Campinas, SP, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17292501

Citation

Aidar-Ugrinovich, L, et al. "Serotypes, Virulence Genes, and Intimin Types of Shiga Toxin-producing Escherichia Coli (STEC) and Enteropathogenic E. Coli (EPEC) Isolated From Calves in São Paulo, Brazil." International Journal of Food Microbiology, vol. 115, no. 3, 2007, pp. 297-306.
Aidar-Ugrinovich L, Blanco J, Blanco M, et al. Serotypes, virulence genes, and intimin types of Shiga toxin-producing Escherichia coli (STEC) and enteropathogenic E. coli (EPEC) isolated from calves in São Paulo, Brazil. Int J Food Microbiol. 2007;115(3):297-306.
Aidar-Ugrinovich, L., Blanco, J., Blanco, M., Blanco, J. E., Leomil, L., Dahbi, G., Mora, A., Onuma, D. L., Silveira, W. D., & Pestana de Castro, A. F. (2007). Serotypes, virulence genes, and intimin types of Shiga toxin-producing Escherichia coli (STEC) and enteropathogenic E. coli (EPEC) isolated from calves in São Paulo, Brazil. International Journal of Food Microbiology, 115(3), 297-306.
Aidar-Ugrinovich L, et al. Serotypes, Virulence Genes, and Intimin Types of Shiga Toxin-producing Escherichia Coli (STEC) and Enteropathogenic E. Coli (EPEC) Isolated From Calves in São Paulo, Brazil. Int J Food Microbiol. 2007 Apr 20;115(3):297-306. PubMed PMID: 17292501.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Serotypes, virulence genes, and intimin types of Shiga toxin-producing Escherichia coli (STEC) and enteropathogenic E. coli (EPEC) isolated from calves in São Paulo, Brazil. AU - Aidar-Ugrinovich,L, AU - Blanco,J, AU - Blanco,M, AU - Blanco,J E, AU - Leomil,L, AU - Dahbi,G, AU - Mora,A, AU - Onuma,D L, AU - Silveira,W D, AU - Pestana de Castro,A F, Y1 - 2007/01/12/ PY - 2005/12/05/received PY - 2006/10/30/accepted PY - 2007/2/13/pubmed PY - 2007/5/30/medline PY - 2007/2/13/entrez SP - 297 EP - 306 JF - International journal of food microbiology JO - Int J Food Microbiol VL - 115 IS - 3 N2 - Shiga toxin-producing Escherichia coli (STEC), is the most important recently emerged group of foodborne pathogens. Ruminants, especially cattle, have been implicated as a principal reservoir of STEC, undercooked ground beef and raw milk being the major vehicles of foodborne outbreaks. Enteropathogenic E. coli (EPEC) strains are defined as eae-harboring diarrheagenic E. coli that possess the ability to form A/E lesions on intestinal cells and that do not possess Shiga toxin genes. In order to determine the occurrence, serotypes and virulence markers of STEC and EPEC strains, 546 fecal samples from 264 diarrheic calves and 282 healthy calves in beef farms in São Paulo, Brazil, were screened by PCR. STEC and EPEC were isolated in 10% and 2.7% of the 546 animals, respectively. Although IMS test was used, the STEC serotype O157:H7 was not detected. The most frequent serotypes among STEC strains were O7:H10, O22:H16, O111:H(-), O119:H(-) and O174:H21, whereas O26:H11, O123:H11 and O177:H11 were the most prevalent among EPEC strains. In this study, serotypes not previously reported were found among STEC strains: O7:H7, O7:H10, O48:H7, O111:H19, O123:H2, O132:H51, O173:H(-), and O175:H49. The eae gene was detected in 25% of the STEC and 100% of EPEC strains. The intimin type theta/gamma2 was the most frequent among STEC, whereas the intimin beta1 was the most frequent intimin type among EPEC strains. To our knowledge, this is the first report of the occurrence of the new intimin muB in one strain of animal origin. This new intimin was detected in one atypical EPEC strain of serotype O123:H? isolated from diarrheic cattle. The enterohemolysin (ehxA) was detected in 51% of the STEC and 80% of the EPEC strains, whereas STEC autoagglutinating adhesin (saa) virulence gene was detected only in those STEC strains negative for eae gene. All 15 bovine EPEC strains isolated in this study were negative for both eaf and bfp genes. Our data shows that in Brazil cattle are not only a reservoir of STEC and atypical EPEC, but also a potential source of infection in humans, since the important STEC serotypes previously described and associated with severe diseases in humans, such as O111:H(-), O113:H21, O118:H16, and O174:H21 were isolated. SN - 0168-1605 UR - https://www.unboundmedicine.com/medline/citation/17292501/Serotypes_virulence_genes_and_intimin_types_of_Shiga_toxin_producing_Escherichia_coli__STEC__and_enteropathogenic_E__coli__EPEC__isolated_from_calves_in_São_Paulo_Brazil_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0168-1605(07)00022-0 DB - PRIME DP - Unbound Medicine ER -