Without the participation in the program of all farms present in the area, progress will be minimal or nil.
From lab to field
Virulence and infectivity differences between strains are notorious. Moreover, the new virus is not controlled with vaccines developed from classical strains and may yield false positives in some diagnostic tests.
Any contact between fattening pigs of different age during restocking of compartments increased the risk.
The immune status of farms is quite possibly different from the one they had before piglets mass vaccinations.
Despite not having a consistent post-vaccination serological reaction, vaccinated animals behave differently from unvaccinated animals under field conditions.The article explains why vaccines offer protection.
Effect of modified-live porcine reproductive and respiratory syndrome virus vaccine on the shedding of wild-type virus from an infected population of growing pigs.
After 24 years of experience we still don't have a control plan agreed upon and accepted by all our technical community. Why?