Characterization of virulence factors and phylogenetic group determination of Escherichia coli isolated from diarrheic and non-diarrheic calves from Brazil
Language English Country United States Media print-electronic
Document type Journal Article
PubMed
27787756
DOI
10.1007/s12223-016-0480-9
PII: 10.1007/s12223-016-0480-9
Knihovny.cz E-resources
- Keywords
- Calves, Escherichia coli, Pathovars, Phylogenetic group,
- MeSH
- DNA, Bacterial genetics MeSH
- Enteropathogenic Escherichia coli classification genetics growth & development pathogenicity MeSH
- Enterotoxigenic Escherichia coli classification genetics growth & development pathogenicity MeSH
- Gene Expression MeSH
- Virulence Factors genetics metabolism MeSH
- Feces microbiology MeSH
- Phylogeny MeSH
- Genotype MeSH
- Escherichia coli Infections diagnosis microbiology pathology veterinary MeSH
- Cattle Diseases diagnosis microbiology pathology MeSH
- Polymerase Chain Reaction MeSH
- Diarrhea diagnosis microbiology pathology veterinary MeSH
- Shiga-Toxigenic Escherichia coli classification genetics growth & development pathogenicity MeSH
- Cattle MeSH
- Bacterial Typing Techniques MeSH
- Virulence MeSH
- Animals MeSH
- Check Tag
- Male MeSH
- Cattle MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- Brazil MeSH
- Names of Substances
- DNA, Bacterial MeSH
- Virulence Factors MeSH
This study aimed to detect virulence factors, pathovars, and phylogenetic groups of Escherichia coli strains obtained from feces of calves with and without diarrhea up to 70 days old and to determine the association between occurrence of diarrhea, phylogenetic groups, and pathovars. Phylo-typing analysis of the 336 E. coli strains isolated from calves with Clermont method showed that 21 (6.25 %) belong to phylogroup A, 228 (67.85 %) to phylogroup B1, 2 (0.6 %) to phylogroup B2, 5 (1.49 %) to phylogroup C, 57 (16.96 %) to phylogroup E, and 3 (0.9 %) to phylogroup F. Phylogroup D was not identified and 20 strains (5.95 %) were assigned as "unknown." The distribution of phylogenetic groups among pathovars showed that NTEC belong to phylogroups B1 (17) and C (4); EPEC to phylogroups B1 (6) and E (8); STEC to phylogroups A (5), B1 (56), B2 (2), C (1), and E (15); EHEC to phylogroups B1 (95) and E (5); and ETEC to phylogroups A (3), B1 (7), and E (10). The EAST-1 strains were phylogroups A (13), B1 (47), E (19), and F (3); E. coli strains of "unknown" phylogroups belonged to pathovars EPEC (1), EHEC (2), STEC (7), and EAST-1 strains (6). ETEC was associated with diarrhea (P = 0.002). Our study did not find association between the phylogenetic background and occurrence of diarrhea (P = 0.164) but did find some relationship in phylogenetic group and pathovar. The study showed that EHEC and STEC are classified as phylogroup B1, EAST-1 phylogroup A, ETEC, and EPEC phylogroup E.
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