Submitted to: Meeting Abstract
Publication Type: Proceedings
Publication Acceptance Date: 3/13/1996
Publication Date: N/A
Citation: N/A Interpretive Summary:
Technical Abstract: We are focusing on factors that predispose to Salmonella spp. infection in commercial pig production systems. First, we will define the herd-level and pig-level prevalence for Salmonella infection. Second, we will quantify the farm-level risk factors for Salmonella herd- and pig-level prevalence. The determination of Salmonella infection is species and serotype specific. Twenty-five pigs will be sampled on the farm and 15 at slaughter from each of 70 herds that participate in an ongoing slaughter monitoring project (PigMON). Risks will be assessed by a survey of farms at the time of the slaughter inspection. Information is being collected regarding farm management, facilities, equipment, and feed, among others. Multivariate categorical analysis will be used to quantify the relative odds of infection with the presence of potential risk factors. We expect to accurately define herd- and pig-level prevalence of Salmonella spp. among commercial farms that use the PigMON system, and to provide a comprehensive assessment of farm-level risk factors. This project is expected to provide the important information on hazards to allow for the development of farm-level HACCP protocols. As of March 1, 1996, we have collected samples from 32 farms; serotype data is available from 21 farms and 14 serotypes have been isolated. The 5 most common isolates have been S. derby, S. agona, S. typhimurium (copenhagen), S. anatum, and S. schwarzengrund. Farm- and pig-level prevalence of Salmonella spp. have been higher in cecal contents collected at the slaughter plant than in feces collected at the farm. Culture results are known for 1,591 samples, 127 (8%) are positive.