Effect of farm type on within-herd Salmonella prevalence, serovar distribution, and antimicrobial resistance

G Rasschaert, J Michiels, D Arijs, C Wildemauwe, Stefaan De Smet, M Heyndrickx

    Research output: Contribution to journalA1: Web of Science-articlepeer-review


    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.
    Original languageEnglish
    JournalJournal of Food Protection
    Issue number5
    Pages (from-to)859-66
    Number of pages8
    Publication statusPublished - 2012


    • Animal Husbandry
    • Animals
    • Anti-Bacterial Agents
    • Bacterial Shedding
    • Colony Count, Microbial
    • Consumer Product Safety
    • Drug Resistance, Bacterial
    • Drug Resistance, Multiple, Bacterial
    • Feces
    • Food Contamination
    • Housing, Animal
    • Humans
    • Prevalence
    • Salmonella
    • Salmonella Food Poisoning
    • Salmonella Infections, Animal
    • Swine
    • Swine Diseases


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