Heterologous challenge with a highly virulent Asian (Genotype-II) strain

The emergence of highly virulent PRRS virus (PRRSV) strains in China in 2006 was a milestone in the epidemiology of PRRS in Asia. Nowadays, genotype II strains of different virulence coexist with genotype-I strains in this continent. At present, Amervac-PRRS (a genotype-I vaccine) is licensed and marketed in many countries of Asia and, therefore, contact of vaccinated herds with highly virulent genotype-II strains can be expected. By M. Roca1, S. Bruguera1, M. Gimeno2, 3, I. Díaz3, I. Galindo2