Finding an occasional pig with PCVAD within a large population is not unexpected since vaccination compliance is rarely 100%. How does one assess impact of PCVAD in a vaccinated population?
Porcine circovirus (PCV2)
It is a test that allows the verification of the carrying out and/or the quality of the vaccination in cases such as the entrance of piglets for their fattening.
The first cause of PCV vaccine failure is the purchase and use of generic vaccine of low quality and titre, but the exact cause of the failures can occur in various forms.
During 2012 PCV2 variants or mutants (mPCV2) appeared in the USA and were frequently associated with PCV-associated diseases. The possibility of lack of cross-protection of commercial vaccines against mPCV2 is now of major concern.
Reducing piglets mingling in farrowing and nursery facilities was found to delay the infectious process leading to a lower number of early infections. Clustering piglets by litter in small units after weaning also decreased significantly the probability of early infection.
What further increases profitability in pig production is not minimizing costs, but maximizing revenue.
Despite the evident usefulness of laboratory diagnosis, we must not forget that a field necropsy allows us to us recover part of the loss caused by the death of the animal.