Phylogenetic analysis and classification of BVDV based on N^pro: The phylogenetic tree that represents the genetic relationship of BVDV strains was constructed from 349 nucleotides of the N^pro coding sequences. The genetic analysis was calculated and the figure prepared as described for Figure 2. The sub-genotype BVDV type-1l was assigned according to [36, 39]. The strains So CP/75 and TR8/TR16, which were also labeled as BVDV-1l by [5, 102] and [104], were renamed as BVDV type-1n and -1p, respectively. BVDV sub-genotypes m, n, and o were named as in [70]. All other groups were assigned as suggested by [97, 98]. (A color version of this figure is available at www.vetres.org.)