Phylogenetic analysis of pestivirus based on the 5'-untranslated region.
A phylogenetic tree of pestiviruses constructed by analyzing their 5'-untranslated region (UTR) indicated that the genetic relatedness between border disease virus and hog cholera virus is much closer than that between genotypes of various bovine diarrhoea viruses. This suggests that these viruses are host variants within a single species, which can be distinguished by comparison of secondary structures at three variable loci in the 5'-UTR.