Figure 2. Unrooted neighbor-joining phylogenetic tree based on the 5′ untranslated region sequence among pestiviruses isolated from chamois, Spain. Chamois strains were enclosed in a differentiated group into border disease virus 4 (BDV-4). Numbers on the branches indicate percentage bootstrap values of 1,000 replicates. Numbers on the right in parentheses indicate GenBank accession numbers. CSFV, classical swine fever virus; BVDV, bovine viral diarrhea virus.