dr. david wright - prrs: understanding the current state, future impact and what producers can do to...
TRANSCRIPT
PRRS:
Current Situation
Applied Research
Opportunities
Minnesota Pork CongressJanuary 14, 2014
Dave Wright, N212 Coordinator
Current PRRS Situation
Regionally
Nationally
MN N212 REGIONAL PRRS
ELIMINATION PROJECT
UPDATE
MN N212 Jan 2014
N212 Progress Report2009 Jan 2013 Jan 2014
Sites Identified 446 812 872
Signed Participation
Agreements266 408 567
Positive PRRS Sites 38 89 72
Stable Vaccinated 18 88
Negative PRRS 247 273 308
Empty Sites 88 107
Unknown Status 181 343 296
Stevens County 2004
Stevens County 2006
Stevens County Area Jan 2013
Stevens County Area Jan 2014
Kandiyohi-Renville Jan 2013
Kandiyohi-Renville Jan 2014
PRRS Incidence Study
Steve
Tousignant
SDEC
Website
National PRRSv Incidence Project
Current Exponentially Weighted Moving Average Analysis 12/20/2013
PRRS Incidence Study
Steve
Tousignant
SDEC
Website
Cumulative Incidence 12/20/2013
Future Impact of PRRS
PRRS is still with us,
but there is hope!
Progress Through
Application of Research
PRRSv Alone:
Impact on Grow-Finish
• Reduced growth rate: 20%
• Reduced feed intake: 7%
• Reduced feed efficiency: 15%
• Cost: $14 per head
• Extended finishing period by 25 days
N Gabler, et al-ISU
Daniel Linhares PRRS
Elimination Study
• TTN-Total Time to Negative
• TTBP-Total Time to Baseline
Production
• Observations on Standard Testing
Protocols
More Aggressive Monitoring
During Herd Closure
Monitoring scheme based on n=30
samples/month over 4 months
assumes that PRRSv infection dies out
within 90 days once prevalence is
below 10%. We showed that this is not
always the case.
Linhares-UofM
Herd Closure Monitoring
• 3 consecutive samples of 30 pigs PCR
negative at 2-week intervals
• 3 consecutive samples of 60 pigs PCR
negative at 2-week intervals
• Collect 6 rope samples from 12 litters
on weeks opposite serum collection
• Monthly testing of weaned pigs and
sampling of 10 head of naïve sentinels
Pipestone Vet Clinic
Herd Closure based on
“Best Practices”
• Exposure method: MLV over LVI
Shorter TTBP despite longer TTN
MLV better economical choice than LVI
Linhares UofM
• Break Point for Control vs Eradication:
3 Years(If frequency of new break > 3yrs, Eradicate;
If < 3 yrs, Control) Clayton Johnson, Maschoffs
Bioportal
• Powerful real-time mapping and data
analysis system using shared
information
• Andres Perez now on staff at
University of Minnesota
Packing Plant Transport
Biosecurity Study
• 17% positive on arrival; 11% of clean
positive on departure
• 1/3 (28%) of trucks leaving packing
plant are contaminated with PEDv
• Prompted discussion-best practices
-Allow driver to remain in cab
-Side entry trailers/line of separation
P. Yeske et. al. NPB
Progress in 2013
• Delayed incidence of new infections
nationally
• Recovery in Stevens County area
• Value of regional control efforts
More than 30 similar projects nationally
• Attitude changes allowing shared
information
Opportunities for 2014
• Include PEDV in N212 project
• Automated downloading of participant’s
lab reports from MN, SDSU and ISU
VDL’s
• Bar code labels with Prem ID’s available
• Investigate the feasibility of making
PRRS and/or PEDV a reportable
disease
Needs for the Future
• Vaccine with consistent cross protection
and marker capability
• Ability to predict immunity
• Improved surveillance testing and
reporting
Continue to Cooperate and
Communicate!
Thanks!
• MN Pork Producers, MN Pork Board
• University of Minnesota-SDEC
Montse Torremorell, Bob Morrison
• Supporting Veterinarians
• Participating Producers
Dave Wright, D.V.M.763-242-7535
MN N212 Regional PRRS Elimination Project Coordinator