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status. Bacteriology of the faecal samples from the lorries shows that they are frequently contaminated with Salmonella. Our data suggest that the contamination could not always be attributed to the just unloaded pigs. In six herds blood and pen faecal samples were all negative while one or more corresponding samples of the lorries were positive. The Salmonella serotypes found on the lorries would, if they had been present in the herd, have given a clear serological response in the Salmonella mix-ELISA test. Therefore we conclude that the effectiveness of the cleaning and disinfection protocols should be improved. Acknowledgement: The authors thank the participating abattoir and their employees, the laboratory of the Animal Health Service, CCL Nutricontrol and Jan Lommerse for their help in this study. The Authors thank the Product Boards for Livestock, Meat and Eggs for financing this study.

Cost-effectiveness of Salmonella control in the pork chain using maximum acceptable prevalence levels