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

  • M. A. STEVENSON (a1), P. L. MORGAN (a2), J. SANHUEZA (a3), G. E. OAKLEY (a4), R. S. BATEMAN (a5), A. McFADDEN (a6), N. MacPHERSON (a7), K. L. OWEN (a6), L. BURTON (a8), S. WALSH (a8), J. WESTON (a3) and R. MARCHANT (a9)...

Summary

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 supplementary feeds used on dairy farms (regardless of type) need to be stored and handled appropriately to reduce the likelihood of bacterial contamination, particularly from birds and rodents. Magnesium supplementation in the pelletized form played a role in triggering outbreaks of acute salmonellosis in New Zealand dairy herds in 2011–2012.

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Copyright

Corresponding author

*Author for correspondence: Professor M. A. Stevenson, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville 3010, Victoria Australia. (Email: mark.stevenson1@unimelb.edu.au)

References

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1. Radostits, O, et al. Veterinary Medicine: A Textbook of the Diseases of Cattle, Horses, Sheep, Pigs and Goats. London: Saunders Ltd, 2007, pp. 896920.
2. Lal, A, et al. The epidemiology of human salmonellosis in New Zealand, 1997–2008. Epidemiology and Infection 2011; 140: 16851694.
3. Owen, K. Undiagnosed disease, bovine – New Zealand (02). ProMed, 20 December 2011 (http://www.promedmail.org), archive no. 20111220·3639.
4. Anon. New Zealand Dairy statistics 2010–11. Hamilton New Zealand: DairyNZ and Livestock Improvement Corporation Limited, 2011.
5. McFadden, A, et al. Spatial and temporal trends of salmonellosis in dairy cattle in New Zealand 2007–2010. Wellington New Zealand: Ministry for Primary Industries, 2012.
6. Stevenson, MA. A case definition for acute salmonellosis in dairy herds in New Zealand. New Zealand Veterinary Journal 2012; 60: 263.
7. Dupont, W, Plummer, W. Power and sample size calculations: a review and computer program. Controlled Clinical Trials 1990; 11: 116128.
8. Kelsey, J, et al. Methods in Observational Epidemiology. New York: Oxford University Press, 1996, pp. 188213.
9. Stevens, D, Olsen, A. Spatially-balanced sampling of natural resources. Journal of the American Statistical Association 2004; 99: 262278.
10. Stevenson, MA, et al. Epidemiological investigations of salmonellosis in New Zealand dairy herds, 2011–2012. In: Proceedings of the Society of Dairy Cattle Veterinarians of the New Zealand Veterinary Association. Hamilton, New Zealand: VetLearn Foundation, 2012, pp. 208212.
11. R Development Core Team. R: a language and environment for statistical computing. Vienna, Austria: R Foundation for Statistical Computing, 2012.
12. Whittemore, A. Statistical methods for estimating attributable risk from retrospective data. Statistics in Medicine 1982; 1: 229243.
13. Coughlin, S, et al. Attributable risk estimation in case-control studies. Epidemiology Reviews 1998; 16: 5164.
14. Bingham, P. Quarterly report: Investigations of suspected exotic diseases. Surveillance. 2010; 37: 2228.
15. Cullwick, J. Salmonella in cows. In: Proceedings of the Society of Sheep and Beef Cattle Veterinarians of the New Zealand Veterinary Association. Palmerston North, New Zealand: VetLearn Foundation, 2009, pp. 5963.
16. Teague, B. Salmonella typhimurium outbreaks in dairy herds. In: Proceedings of the Society of Dairy Cattle Veterinarians of the New Zealand Veterinary Association. Hamilton, New Zealand: VetLearn Foundation, 2011, pp. 7·19·17·19·6.
17. Stevenson, MA, et al. Decision support systems for monitoring and maintaining health in food animal populations. New Zealand Veterinary Journal 2007; 55: 264272.
18. Morton, J. Identification of factors contributing to severe epidemics of salmonellosis in dairy herds. Final Report for Project DAV 280. Melbourne Australia: Dairy Research and Development Corporation, Australia, 1993.
19. Dwyer, D, et al. Use of case-control studies in outbreak investigations. Epidemiology Reviews 1998; 16: 109123.
20. Blake, P. Cholera for a dime. In: Dworkin, M, ed. Outbreak Investigations Around the World. Boston: Jones and Bartlett Publishers, 2010, pp. 3763.
21. Elwood, J. Critical Appraisal of Epidemiological Studies and Clinical Trials. London: Oxford University Press, 2007, pp. 329330.
22. Mattila, T, et al. The growth of Salmonella in rumen fluid from cattle at slaughter. Epidemiology and Infection. 1988; 101: 337345.
23. Bender, J, et al. Animal by-products contaminated with Salmonella in the diets of lactating dairy cows. Journal of Dairy Science 1997; 80: 30643067.

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

  • M. A. STEVENSON (a1), P. L. MORGAN (a2), J. SANHUEZA (a3), G. E. OAKLEY (a4), R. S. BATEMAN (a5), A. McFADDEN (a6), N. MacPHERSON (a7), K. L. OWEN (a6), L. BURTON (a8), S. WALSH (a8), J. WESTON (a3) and R. MARCHANT (a9)...

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