change in predominance of bovine viral diarrhea virus subgenotypes among samples submitted to a diagnostic laboratory over a 20-year time span.although the causative agent of bovine viral diarrhea was initially categorized as 1 species, phylogenetic analysis revealed that these viruses belong to 2 different species, bovine viral diarrhea virus 1 (bvdv-1) and bvdv-2, with 2-11 subgenotypes within each species. distribution of species and subgenotypes has been shown to vary with geographic region. whether distribution shifts over time is not known. surveys conducted between 1994 and 2008 reported 3 subgenotypes circulating among cattle i ...201121398436
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