Isolation of Streptococcus uberis from different sites of the dairy cow

S.J. Lacy-Hulbert; R.T. Cursons; M.G. Lopez-Benavides; J.H. Williamson; E.L. Summers; S.M. Pryor; M.W. Woolford

Isolation of Streptococcus uberis from different sites of the dairy cow

in Mastitis in dairy production

Autor:innen:

S.J. Lacy-Hulbert

S.J. Lacy-Hulbert ¹Dexcel, Hamilton, New Zealand

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R.T. Cursons

R.T. Cursons ²Dept of Biological Sciences, University of Waikato, Hamilton, New Zealand

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M.G. Lopez-Benavides

M.G. Lopez-Benavides ¹Dexcel, Hamilton, New Zealand

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J.H. Williamson

J.H. Williamson ¹Dexcel, Hamilton, New Zealand

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E.L. Summers

E.L. Summers ¹Dexcel, Hamilton, New Zealand

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S.M. Pryor

S.M. Pryor ²Dept of Biological Sciences, University of Waikato, Hamilton, New Zealand

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, und

M.W. Woolford

M.W. Woolford ¹Dexcel, Hamilton, New Zealand

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Art:: Kapitel

Seiten:: 635–641

DOI:: https://doi.org/10.3920/9789086865505_097

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Streptococcus uberis is the leading cause of clinical mastitis in New Zealand but the primary source of the bacterium in a pasture-based system is unknown. Identifying the niches in the dairy cow’s environment that are colonised by S. uberis will enable the identification of risk factors and development of effective management strategies that prevent mastitis. Identification of such niches has been hampered by a lack of simple methods to selectively isolate S. uberis, but using a selective media, the bacterium has been successfully isolated from heavily contaminated samples derived from faecal material and teat skin. Isolates confirmed to be S. uberis by 16-23S PCR were then strain-typed using Rep-PCR typing.

Over 16 months, a herd of approximately 100 cows were monitored for the presence of S. uberis from specific anatomical sites of the cow. On any single occasion, the bacteria could be isolated from faeces of an average of 5.6% of cows sampled but some cows (7) yielded the bacteria repeatedly whilst others (6) proved to be positive for the bacteria on only one occasion. The bacteria could be isolated only intermittently from teat skin but more frequent isolations were observed in the dry period, which coincided with the suspension of post-milking teat disinfection.

Cows with S. uberis mastitis were sampled anatomically for the presence of the same infective strain. This strain was not detected in faecal material but was detected on feet and on the skin of the infected teat. It is suggested that these body sites became contaminated following establishment of the intramammary infection. Identifying sites that become colonised during an infection event may aid elucidation of risk factors associated with development of mastitis.

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Mastitis in dairy production

Current knowledge and future solutions

ISBN:: 9789086865505

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 24 Oct 2005

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Isolation of Streptococcus uberis from different sites of the dairy cow

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Mastitis in dairy production

Current knowledge and future solutions

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