Changing PRRS Pattern in the Midwest24 March 2014
US - The 2013-2014 Porcine Reproductive and Respiratory Syndrome (PRRS) epidemic season continues to be surprisingly different, according to Dr Steven Tousignant, Veterinary Population Medicine at the University of Minnesota.
Dr Steven Tousignant has told the American Association of Swine Veterinarians (AASV): "Using previous four years as a baseline for expected number of breaks, we have observed significantly fewer cumulative new breaks through December (p=0.0002).
"When we look at this on a quarterly basis, we have seen fewer breaks from July to September (p=0.0139) and from October to December (0.0049). It is interesting because the differences between the years appears to have started back in the summer months."
He offered several possible reasons to explain this:
- random chance
- better awareness of PRRS epidemic seasons leading to better bio-security preparations
- difficulty identifying PRRS infections in herds co-infected with PED
- reduced PRRS diagnostics during PED outbreaks
- shorter duration of PRRS-positive pig production during PED breaks
- extremely cold weather conditions across much of the Midwest and/or
- next virulent strain of PRRS has not yet arrived.
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