Dr. Bob Morrison - Update on Regional PRRS Elimination Efforts

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Update on Regional PRRS Elimination Efforts - Dr. Bob Morrison, Professor, University of Minnesota College of Veterinary Medicine, from the 2012 Annual Conference of the National Institute for Animal Agriculture, March 26 - 29, Denver, CO, USA.

More presentations at: http://www.trufflemedia.com/agmedia/conference/2012-decreasing-resources-increasing-regulation-advance-animal-agriculture

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Dr. Bob Morrison - Update on Regional PRRS Elimination Efforts

  1. 1. Evaluating Regional Projects & Opportunities for PRRS Elimination Bob Morrison DVM, MBA, PhD University of Minnesota & USDA PRRS CAP
  2. 2. Outline • National Incidence Project • Regional projects • Working groups
  3. 3. “PRRS is sure ______ this year”
  4. 4. National PRRS Incidence Project • 5 cooperating systems, all anonymous – 192 sow farms with 584,200 sows as of July 1, 2011 • Vets report change in status on weekly basis – dx criteria vary across systems • Positive unstable (infected) herds are not considered “at risk”
  5. 5. Limitations • Data are not representative of US industry. • Monitoring of herds varies among the 5 systems and PRRS status might be a “best guess”. • Calculation methods are evolving.
  6. 6. Progress Regionally: • High density - Farms in high density are being bombarded with virus. – Filtering will significantly decrease incidence of infection and can be wise investment. – There is little room for error.
  7. 7. Where are we going? • National incidence / prevalence project – Location based risk assessment – Sharing status, location … & sequence
  8. 8. aggregate 2009 / '10 43% 2010 / '11 39% 2011 / '12 50% 2012 / '13 40% 2017 / '18 25% 2022 / '23 10%
  9. 9. Where are we?
  10. 10. N212MN Project • N212MN funding – ’04 – ’06 - none – ’07 – ’09 - USDA – ‘10 – ’12 – PRRS CAP & UMN SDEC • Rice – MPB – BI PRRS Initiative – AASV • Disclosure: – RBM - 2 sow farms in Stevens Cy • IACUC: – 0711A21864
  11. 11. Stevens County
  12. 12. Stevens County 2004 2011 Reduced infected farms from 31 in 2004 to none known in 2012 (5.7% of sites unknown)
  13. 13. Voluntary, Producer-led • All within the region will benefit, but • Not all will participate. “Producer-led”: - Acceptance - Patience - Subtle persistence
  14. 14. First Expansion
  15. 15. Second Expansion
  16. 16. Identified sites in the region • 251 negative sites • 46 positive sites • 409 unknown sites • 706 sites identified • 315 have signed the participation agreement
  17. 17. Has sows Growing pigs, no sows negative unknown positive Nate Winkelman Local & regional vets Swine Vet Center
  18. 18. PRRS CAP website
  19. 19. Region: West Michigan Density sows:24000 total, 17/sq mile Date feb 11, 2012 Density pigs: 245000 total; 176/ sq mi <=100 >3000 Farrow to wean 0 Farrow to feeder 0 Farrow to finish 2 Show Unknown <=100 >3000 Unknown 0 Positive 0 Positive stable 2 Negative provisional 0 Negative 0 2 0 3 3 1 1 0 0 1 0 0 0 6 2 5 Sow herd size 101-600 601-1500 1501-3000 4 1 0 4 2 8 3 0 1 Sow herd size 101-600 601-1500 1501-3000 MI Sow herd status 0 8 15 23 30 2010 Q2 2010 Q4 2011 Q2 2011 Q42011 Q4 Unknown Positive Positive stable Negative provisional Negative
  20. 20. Current Issues & Workgroups: • 7 working groups • Failure of some closure programs • Risk factors for spread in hog dense regions
  21. 21. Seven working groups: 1. Standard Of Practice for sow herd management & sampling 2. Certifying regions based on PRRS surveillance and results 3. Risk based sampling 4. Incorporating oral fluids into sampling-testing guidelines 5. Managing the risk of disclosure 6. Farrow to finish herds 7. Guidelines for implementing common reports, including mapping legends
  22. 22. “Voluntary, producer-led, coordinated, regional disease control programs”

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