The University of Minnesota has released preliminary findings for its lateral spread study on porcine epidemic diarrhea virus (PEDV). Researchers emphasize that the results will change as more data are available and analyzed.

Data from the first 24 company, capacity, and production type matched pairs of case sites and negative control sites (48 total analyzed) from 123 questionnaires were summarized.

  • There were veterinary visits in four positive sites prior to infection compared to none in negative sites.
  • There was approximately double the number of company service visitors visiting positive sites compared to negative sites.
  • There was approximately 60% higher frequency of trucks visiting to remove pigs of any age from positive sites compared to negative sites.
  • There was approximately 2.5 times the frequency of trash pickups from positive sites compared to negative sites.
  • Approximately double the percentage of positive sites had dead haul vehicles visit the site in the two weeks preceding infection.
  • Approximately 10 times the number of positive sites reported pig additions from another site in the operation compared to negative sites.
  • Approximately 3.5 times the number of positive sites reported borrowing equipment from another site compared to negative sites.
  • Approximately double the number of positive sites reported seeing wildlife in the buildings compared to negative sites.
  • Approximately 2.5 times the number of positive sites reported seeing a moderate to severe problem with birds near the site compared to negative farms.
  • Approximately 20% more negative sites used disinfectant on the chute floor in between every loading or unloading of pigs compared to positive sites.

Data from the first nine distance-matched pairs of case sites and negative control sites (18 total analyzed) from 123 questionnaires were summarized.

  • No significant trends were discovered with this group of data
  • Site capacity was not significantly different between positive and negative

Groups of 4,824 average capacity in the negative controls or 4,953 average capacity in the case farms.

The negative sites in this preliminary analysis are now the identified controls for the specific positive sites.

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