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. 2011 Oct 5;53(1):51.
doi: 10.1186/1751-0147-53-51.

Geographical distribution of salmonella infected pig, cattle and sheep herds in Sweden 1993-2010

Susanna Sternberg Lewerin  1 , Lars Skog, Jenny Frössling, Helene Wahlström
Affiliations

Geographical distribution of salmonella infected pig, cattle and sheep herds in Sweden 1993-2010

Susanna Sternberg Lewerin et al. Acta Vet Scand. .

Abstract

Background: The Swedish salmonella control programme covers the entire production chain, from feed to food. All salmonella serotypes are notifiable. On average, less than 20 cases of salmonella in food-producing animals are reported every year. In some situations, the cases would be expected to cluster geographically. The aim of this study was to illustrate the geographic distribution of the salmonella cases detected in pigs, cattle and sheep.

Methods: Data on all herds with pigs, cattle and sheep found to be infected with salmonella during the time period from 1993 to 2010 were obtained from the Swedish Board of Agriculture. Using the ArcGIS software, various maps were produced of infected herds, stratified on animal species as well as salmonella serotype. Based on ocular inspection of all maps, some were collapsed and some used separately. Data were also examined for temporal trends.

Results: No geographical clustering was observed for ovine or porcine cases. Cattle herds infected with Salmonella Dublin were mainly located in the southeast region and cattle herds infected with Salmonella Typhimurium in the most southern part of the country. Some seasonal variation was seen in cattle, but available data was not sufficient for further analyses.

Conclusions: Analyses of data on salmonella infected herds revealed some spatial and temporal patterns for salmonella in cattle. However, despite using 18 years' of data, the number of infected herds was too low for any useful statistical analyses.

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Figures

Figure 1
Figure 1
Number of salmonella infected herds of different animal species in Sweden 1993-2010.
Figure 2
Figure 2
Salmonella infected pig herds in Sweden 1993-2010.
Figure 3
Figure 3
Density of pigs by 3 digit postal code area in Sweden in 2007. Density represents the number of animals, including adults, weaners, growers and fattening pigs, per 100 km2. © Lantmäteriet Gävle 2009, permission number I 2009/0830.
Figure 4
Figure 4
Pig herds infected with Salmonella Typhimurium phage type 40 in Sweden 1993-2010.
Figure 5
Figure 5
Cattle herds infected with Salmonella Dublin in Sweden 1993-2010.
Figure 6
Figure 6
Cattle herds infected with Salmonella Typhimurium in Sweden 1993-2010.
Figure 7
Figure 7
Cattle herds infected with serotypes other than Salmonella Dublin or Salmonella Typhimurium in Sweden 1993-2010.
Figure 8
Figure 8
Density of cattle (i.e. number of animals > 1 year of age per 100 km2) by 3 digit postal code area in Sweden in 2008. © Lantmäteriet Gävle 2009, permission number I 2009/0830.
Figure 9
Figure 9
Salmonella infected sheep herds in Sweden 1993-2010.
Figure 10
Figure 10
Number of salmonella infected Swedish cattle herds detected per calendar month.
See this image and copyright information in PMC

References

    1. Sternberg Lewerin S, Wahlström H, Häggblom P, Szanto E, Plym Forshell L. The Swedish national salmonella control programme - future challenges. Proceedings of International Symposium on Salmonella and Salmonellosis (I3S): 10-12 May 2006; St Malo, France. 2006. pp. 531–534.
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