Effect of Farm Type on Within-Herd Salmonella Prevalence, Serovar Distribution, and Antimicrobial Resistance
Source: Journal of Food Protection®, Number 5, May 2012, pp. 812-997 , pp. 859-866(8)
Abstract:Salmonella represents a major challenge to the pig industry, as pork presents a risk for human salmonellosis. In this study, we have examined the effect of farm type on the prevalence of fattening pigs shedding Salmonella on 12 farms at risk for harboring Salmonella. On six open (grow-to-finish) and six closed (farrow-to-finish) farms, the prevalence of pigs shedding Salmonella was determined on two occasions approximately 2 months apart. The serovar, phage type, and antimicrobial resistance of the obtained Salmonella isolates were determined. On all farms, pigs shedding Salmonella were detected on at least one of the two sampling days. The mean within-herd prevalence was 7.8%. Closed farms were two times less likely to have pigs shedding Salmonella than open farms. On open farms, the odds of finding Salmonella shedding in pigs were 1.9 times higher when sampling was performed at slaughter age than when samples were taken halfway through the fattening period. Salmonella enterica serovar Typhimurium was the most predominant serotype, with a prevalence of 62 to 63% on both farm types. Of all the Salmonella Typhimurium isolates, 65% had the tetraresistant profile ASSuT (ampicillin, streptomycin, sulfonamide, and tetracycline) with or without additional resistance to trimethoprim-sulfonamide. Phage type DT120 seemed to be especially associated with this antimicrobial-resistant profile. The prevalence of Salmonella Typhimurium isolates showing resistance to ampicillin, streptomycin, tetracycline, sulfonamide, trimethoprim-sulfonamide, and lincomycin hydrochloride and spectinomycin sulfate tetrahydrate was significantly higher on open farms than on closed farms.
Document Type: Research Article
Affiliations: 1: Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090 Melle, Belgium;, Email: Geertrui.firstname.lastname@example.org 2: Ghent University College, Faculty of Biosciences and Landscape Architecture, Kortrijksesteenweg 14, 9000 Ghent, Belgium, Ghent University, Faculty of Bioscience Engineering, Department of Animal Production, Laboratory for Animal Nutrition and Animal Product Quality, Proefhoevestraat 10, 9090 Melle, Belgium 3: Animal Health Care of Flanders (DGZ), Deinse Horsweg 1, 9031 Drongen, Belgium 4: Scientific Institute of Public Health, Communicable and Infectious Diseases, Directorate Bacterial Diseases, Engelandstraat 642, 1180 Brussels, Belgium 5: Ghent University, Faculty of Bioscience Engineering, Department of Animal Production, Laboratory for Animal Nutrition and Animal Product Quality, Proefhoevestraat 10, 9090 Melle, Belgium 6: Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Science Unit, Brusselsesteenweg 370, 9090 Melle, Belgium, Ghent University, Faculty of Veterinary Medicine, Department of Pathology, Bacteriology and Poultry Diseases, Salisburylaan 133, 9820 Merelbeke, Belgium
Publication date: May 2012
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