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This study confirms that UNISTRAIN® PRRS vaccine could effectively control reproductive failures induced by PRRSV through increased ratio of live born to total born piglets and decreased mortality rate of suckling piglets.
Genetic/antigenic diversity and variability in the immunobiological properties of the PRRSV (3,4) may compromise the heterologous protection generated by vaccination in PRRS control strategies. Although PRRS immunity is not yet fully understood, the significance not only of the NA but the cell-mediated immunity is important for a better understanding of vaccine performance (3). The present study showed that primo-immunization of naïve gilts with UNISTRAIN® PRRS induced a significant specific cell-mediated immunity against 5 heterologous PRRSV strains.