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Bovine herpesvirus type 2 (BoHV-2), also known as bovine mammillitis virus, is classified in the Family Herpesviridae, Subfamily Alphaherpesvirinae, and Genus Simplexvirus along with herpes simplex viruses type 1 and 2 (HSV-1 and HSV-2) and other primate simplexviruses on the basis of similarities in 4 genes within the 15 kb UL 23–29 cluster. This could be explained either by a global similarity or a recombination event that brought primate herpesviral sequences into a bovine virus. Our sequences for DNA polymerase (UL30), a large gene adjacent to the previously identified conserved cluster, and glycoprotein G (US4), a gene as distant from the cluster as possible on the circularized genome, confirm the close relationship between BoHV-2 and the primate simplexviruses, and argue for a global similarity and probably a close evolutionary relationship. Thus one can speculate that BoHV-2 may represent a greater hazard to humans than has been appreciated previously. |
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