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    Population and Virulence Factor Analysis of Staphylococcus aureus from Bovine Mastitis.

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    Author
    Fitzgerald, J.R.
    Meaney, William J
    Hartigan, Patrick J.
    Smyth, Cyril James
    Keyword
    Bovine mastitis
    Staphylococcus aureus
    genotype
    phenotype
    Date
    2000-11-01
    
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    URI
    http://hdl.handle.net/11019/1402
    Citation
    Fitzgerald, J.R., Meaney, W.J., Hartigan, P.J., Smyth, C.J., Population and Virulence Factor Analysis of Staphylococcus aureus from Bovine Mastitis, End of Project Reports, Teagasc, 2000.
    Abstract
    Staphylococcus aureus is a major cause of bovine mastitis and the disease is responsible for substantial economic losses in the dairy industry world-wide. A large number of commonly accepted virulence factors are associated with S. aureus but it is yet to be elucidated which of these are important for infection of the bovine udder. A rational and effective strategy for the control of intramammary infections may need to be directed against clones of S. aureus that commonly cause disease. The objective of this study was to characterise the genetic variance of S. aureus isolate populations from infected udders in Ireland using RAPD-PCR, ribotyping and multilocus enzyme electrophoresis (MLEE). Similar S. aureus isolates collected in the USA were also typed in order to compare strain differences in staphylococcal populations in a different environment. Phenotypic diversity based on a number of presumed virulence factors together with antibiotic sensitivity was examined and correlations between phenotype and genotype were identified, if present. In addition, a pathogenicity island encoding multiple superantigens was completely sequenced and characterised. Knockout mutants of these superantigens were also constructed and in vitro functional analysis performed. Laboratory animal experiments (mice and rabbits) were used to study the relative pathogenicity of individual staphylococcal strains (mice) and also to measure the immunological responses after prolonged exposure to the predominant strains (rabbits).
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