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ARS Home » Midwest Area » Ames, Iowa » National Animal Disease Center » Food Safety and Enteric Pathogens Research » Research » Publications at this Location » Publication #124336
Title: ESTIMATION OF THE ON-FARM SALMONELLA ENTERICA PREVALENCE IN MARKET SWINE

Author
item HURD, HOWARD
item MCKEAN, J - IOWA STATE UNIVERSITY
item GRIFFITH, R - IOWA STATE UNIVERSITY
item WESLEY, IRENE
item ROSTAGNO, M - FEDERAL UNIV OF LAVRAS

Submitted to: International Symposium on Epidemiology and Control of Salmonella in Pork
Publication Type: Proceedings
Publication Acceptance Date: 9/5/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The objective of this study was to compare fecal culture, meat juice ELISA, and culture of abattoir collected tissues for their ability to accurately estimate the on-farm prevalence of Salmonella enterica in market swine. Six herds, depopulated in the Accelerated Pseudorabies Eradication Program, were used. One-half of study pigs (50) were necropsied on-farm; the other half (50) at a commercial abattoir. The true farm prevalence (TFP), based on positive ileocecal lymph nodes, cecal contents, or fecal samples was estimated at 5.3%. This estimate was higher than any provided by a single sample type cultured. The seroprevalence (meat juice ELISA) was estimated at 20% using a cutoff of OD% > 40. Prevalence estimates from abattoir collected samples were much higher than the TFP; 39.9% of pigs were culture positive. This study shows that a single round of fecal collections will underestimate the true Salmonella status of a herd and that samples collected at the abattoir will overestimate the on- farm prevalence.