Journal article

A case-control study to identify risk factors for acute salmonellosis in New Zealand dairy herds, 2011-2012

MA Stevenson, PL Morgan, J Sanhueza, GE Oakley, RS Bateman, A McFadden, N MacPherson, KL Owen, L Burton, S Walsh, J Weston, R Marchant



In late 2011 the New Zealand Ministry for Primary Industries reported an increase in confirmed laboratory diagnoses of salmonellosis in dairy herds. To identify risk factors for herd-level outbreaks of salmonellosis we conducted a case-control study of New Zealand dairy herds in 2011-2012. In a multivariable analysis, use of continuous feed troughs [adjusted odds ratio (aOR) 6·2, 95% confidence interval (CI) 2·0-20], use of pelletized magnesium supplements (aOR 10, 95% CI 3·3-33) and use of palm kernel meal as a supplementary feed (aOR 8·7, 95% CI 2·5-30) were positively associated with a herd-level outbreak of salmonellosis between 1 July 2011 and 31 January 2012. We conclude that supplemen..

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University of Melbourne Researchers


Funding Acknowledgements

This research was financially supported by the New Zealand Ministry for Primary Industries. The authors sincerely thank the following members of the Fonterra Service Team for their assistance with administration of the questionnaires for this study: S. Blackwell, H. Shepherd, A. Douglas, C. Rowling, N. Wallace, J. Pulford and H. McConnell. We thank the two reviewers for their detailed and helpful comments that have improved the quality of this paper.