For objective 1, evaluation of harvest plants as points or nodes of PEDv transmission. To accomplish this, samples were taken from each trailer before and after unloading pigs at 6 harvest plants. Other information was also collected of activities that could be implicated in transmission such as truck drivers stepping on the dock and plant personnel entering the trailer and the times and docks used were tracked.
This study found 6.6% of trucks contaminated before unloading over all plants and 5.2% of trucks that were negative upon arrival became contaminated in the unloading process. This indicates that the contaminated trucks pulling up to the harvest plant contaminate about one more truck that was clean prior to docking and indicates a point of spread within the industry that needs to be attempted to be controlled to avoid further transmission.
Spatial data and intrinsic farm data were used to evaluate potential transmission risk of herds of different production type and capacity, and herds in areas with higher and lower farm density. This aspect of the study found that sites with sows on the premises and sites greater than 2,000 head may be at increased risk likely due to increased transportation and more frequent input/output of resources at the site. Spatial analysis also found that increased swine density in a region, as well as the site’s proximity to nearest infected neighbor, are also associated with increased infection. Though, this is more of a confirmation of the pathogen’s lateral transmission capability, it is important to be able to identify more at-risk herds and regions using this information. Perhaps at-risk herds can attempt to re-double their biosecurity efforts and avoid infection from their neighbors.
o Bob Morrison, University of Minnesota
o Dane Goede, University of Minnesota
Department of Veterinary Population Medicine
University of Minnesota
385 Animal Science, VMC
1988 Fitch Ave
St Paul, MN 55108