Interaction between attaching and effacing Escherichia coli serotypes O157:H7 and O26:K60 in cell culture
| Autor: | Angus I. Best, K. A. Sprigings, Mark A. Jepson, R. M. La Ragione, Martin J. Woodward, W. A. Cooley |
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| Rok vydání: | 2004 |
| Předmět: |
Serotype
Enterocyte Sheep Diseases medicine.disease_cause Escherichia coli O157 Microbiology Bacterial Adhesion Tissue culture fluids and secretions medicine Animals Humans Escherichia coli Escherichia coli Infections Microscopy Confocal Sheep General Veterinary biology Epithelial Cells General Medicine biology.organism_classification Enterobacteriaceae Virology Colonisation medicine.anatomical_structure Cell culture Bacteria |
| Zdroj: | Veterinary microbiology. 104(1-2) |
| ISSN: | 0378-1135 |
| Popis: | Ruminants harbour both O157:H7 and non-O157 Attaching Effacing Escherichia coli (AEEC) strains but to date only non-O157 AEEC have been shown to induce attaching effacing lesions in naturally infected animals. However, O157 may induce lesions in deliberate oral inoculation studies and persistence is considered dependent upon the bacterially encoded locus for enterocyte effacement. In concurrent infections in ruminants it is unclear whether non-O157 AEEC contribute either positively or negatively to the persistence of E. coli O157:H7. To investigate this, and prior to animal studies, E. coli O157:H7 NCTC 12900, a non-toxigenic strain that persists in conventionally reared sheep, and non-toxigenic AEEC O26:K60 isolates of sheep origin were tested for adherence to HEp-2 tissue culture alone and in competition one with another. Applied together, both strains adhered in similar numbers but lower than when either was applied separately. Pre-incubation of tissue culture with either one strain reduced significantly (P < 0.05) the extent of adherence of the strain that was applied second. It was particularly noticeable that AEEC O26 when applied first reduced adherence and inhibited microcolony formation, as demonstrated by confocal microscopy, of E. coli O157:H7. The possibility that prior colonisation of a ruminant by non-O157 AEEC such as O26 may antagonise O157 colonisation and persistence in ruminants is discussed. |
| Databáze: | OpenAIRE |
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