Abstract
BackgroundThe 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.MethodsData 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.ResultsNo 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.ConclusionsAnalyses 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.
Highlights
The Swedish salmonella control programme covers the entire production chain, from feed to food
The aim of this study was to illustrate the geographic distribution of the salmonella cases detected in pigs, cattle and sheep
Each holding was only included once even if investigations revealed that several animal species were infected
Summary
The Swedish salmonella control programme covers the entire production chain, from feed to food. The Swedish National salmonella control programme covers the entire production chain, from feed to food [1]. All findings of Salmonella spp. in feed, animals or food of animal origin are notifiable and action is always taken to eliminate the infection. Culture is the detection method of choice for most samples from animals, as this is independent of serotype and has a high specificity, both important features for the Swedish situation. Culture from faecal material has a low sensitivity [5] and may only be reliably used on herd level. This fact is accounted for in the control strategies
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