Efficacy of AMERVAC®- PRRS after heterologous challenge with a pathogenic Chinese-like PRRS virus

Throughout the second half of 2006, large-scale, devastating outbreaks of porcine reproductive and respiratory syndrome (PRRS) affected several provinces of China1. That epidemic was linked to a hypervirulent genotype-II PRRS virus (PRRSV) harboring a distinctive deletion1. Economic losses from those outbreaks results from deaths but also from loss weight and impaired performance. Control of such outbreaks proved difficult and those hypervirulent strains spread in Asia.   At present, genot