Genetic variations among PRRSV strains isolated in Italy and in Russia V. G. Andreyev, A. V. Scherbakov, V. A. Pylnov, A. A. Gusev, P. Cordioli and G. SalaVet. Res., 31 1 (2000) 89-90DOI: https://doi.org/10.1051/vetres:2000003