Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Estimation of Sample Sizes for Pooled Faecal Sampling for Detection of "Salmonella" in Pigs

M. E. Arnold and A. J. C. Cook
Epidemiology and Infection
Vol. 137, No. 12 (Dec., 2009), pp. 1734-1741
Stable URL: http://www.jstor.org/stable/40390508
Page Count: 8
  • Read Online (Free)
  • Download ($49.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Estimation of Sample Sizes for Pooled Faecal Sampling for Detection of "Salmonella" in Pigs
Preview not available

Abstract

Salmonella infection in breeding pigs was the subject of a European survey in 2008. The prevalence of pig-breeding holdings infected with Salmonella was determined by microbiological culture of pooled pen faecal samples. The objective of this study was to estimate the sensitivity of pooled faecal sampling and to calculate the required sample sizes. To do this, individuai and pooled faecal samples were collected from a sample of pens from nine farms. Bayesian methods were used to estimate the sensitivity of individuai and pooled faecal sampling, and the degree of clustering of Salmonella at the pen level. Sample sizes were then calculated for various values of design prevalence, taking into account the clustering. Pooling was highly efficient compared to individuai sampling, e. g. with 18 pooled samples required to detect a 10% prevalence with 95% certainty, compared to 35 individuai rectal samples. We recommend that pooled sampling is used for détection of Salmonella in pigs. Results were influenced by the degree of clustering at pen level, and it is important to take this into account both in the estimation of appropriate sample sizes and the estimation of prevalence from pooled sample data.

Page Thumbnails

  • Thumbnail: Page 
[1734]
    [1734]
  • Thumbnail: Page 
1735
    1735
  • Thumbnail: Page 
1736
    1736
  • Thumbnail: Page 
1737
    1737
  • Thumbnail: Page 
1738
    1738
  • Thumbnail: Page 
1739
    1739
  • Thumbnail: Page 
1740
    1740
  • Thumbnail: Page 
1741
    1741