Escherichia coli phylogenetic group determination and its application in the identification of the major animal source of fecal contamination |
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| Authors: | Camila Carlos Mathias M Pires Nancy C Stoppe Elayse M Hachich Maria IZ Sato Tânia AT Gomes Luiz A Amaral Laura MM Ottoboni |
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| Affiliation: | 1.Centro de Biologia Molecular e Engenharia Genética,Universidade Estadual de Campinas - UNICAMP,Campinas,Brasil;2.Programa de Pós Gradua??o em Ecologia, Instituto de Biologia,Universidade Estadual de Campinas - UNICAMP,Campinas,Brasil;3.Departamento de Análises Ambientais,Companhia Ambiental do Estado de S?o Paulo - CETESB,S?o Paulo,Brasil;4.Departamento de Microbiologia, Imunologia e Parasitologia,Universidade Federal de S?o Paulo - UNIFESP,S?o Paulo,Brasil;5.Faculdade de Ciências Agrárias e Veterinárias,Universidade Estadual Paulista - UNESP,Jaboticabal,Brasil |
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| Abstract: | Background Escherichia coli strains are commonly found in the gut microflora of warm-blooded animals. These strains can be assigned to one of the four main phylogenetic groups, A, B1, B2 and D, which can be divided into seven subgroups (A0, A1, B1, B22, B23, D1 and D2), according to the combination of the three genetic markers chuA, yjaA and DNA fragment TspE4.C2. Distinct studies have demonstrated that these phylo-groups differ in the presence of virulence factors, ecological niches and life-history. Therefore, the aim of this work was to analyze the distribution of these E. coli phylo-groups in 94 human strains, 13 chicken strains, 50 cow strains, 16 goat strains, 39 pig strains and 29 sheep strains and to verify the potential of this analysis to investigate the source of fecal contamination. |
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