Borna disease virus: A species in the genus Bornavirus, family BORNAVIRIDAE, causing a rare and usually fatal encephalitic disease in horses and other domestic animals and possibly deer. Its name derives from the city in Saxony where the condition was first described in 1894, but the disease occurs in Europe, N. Africa, and the Near East.Borna Disease: An encephalomyelitis of horses, sheep and cattle caused by BORNA DISEASE VIRUS.Rats, Inbred LewViruses, Unclassified: Viruses whose taxonomic relationships have not been established.Mononegavirales: An order comprising four families of eukaryotic viruses possessing linear, non-segmented, negative-strand RNA genomes. The families are BORNAVIRIDAE; FILOVIRIDAE; PARAMYXOVIRIDAE; and RHABDOVIRIDAE.Viral Proteins: Proteins found in any species of virus.Parapoxvirus: A genus of the family POXVIRIDAE, subfamily CHORDOPOXVIRINAE, which infect ungulates and may infect humans. ORF VIRUS is the type species.LiechtensteinHorse Diseases: Diseases of domestic and wild horses of the species Equus caballus.Bornaviridae: A family in the order MONONEGAVIRALES comprising one genus Bornavirus. This family has a unique form of mRNA processing: replication and transcription takes place in the nucleus.RNA, Viral: Ribonucleic acid that makes up the genetic material of viruses.Horses: Large, hoofed mammals of the family EQUIDAE. Horses are active day and night with most of the day spent seeking and consuming food. Feeding peaks occur in the early morning and late afternoon, and there are several daily periods of rest.Antibodies, Viral: Immunoglobulins produced in response to VIRAL ANTIGENS.Nucleoproteins: Proteins conjugated with nucleic acids.Brain: The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.Meningoencephalitis: An inflammatory process involving the brain (ENCEPHALITIS) and meninges (MENINGITIS), most often produced by pathogenic organisms which invade the central nervous system, and occasionally by toxins, autoimmune disorders, and other conditions.Encephalitis, Viral: Inflammation of brain parenchymal tissue as a result of viral infection. Encephalitis may occur as primary or secondary manifestation of TOGAVIRIDAE INFECTIONS; HERPESVIRIDAE INFECTIONS; ADENOVIRIDAE INFECTIONS; FLAVIVIRIDAE INFECTIONS; BUNYAVIRIDAE INFECTIONS; PICORNAVIRIDAE INFECTIONS; PARAMYXOVIRIDAE INFECTIONS; ORTHOMYXOVIRIDAE INFECTIONS; RETROVIRIDAE INFECTIONS; and ARENAVIRIDAE INFECTIONS.Antigens, Viral: Substances elaborated by viruses that have antigenic activity.Vero Cells: A CELL LINE derived from the kidney of the African green (vervet) monkey, (CERCOPITHECUS AETHIOPS) used primarily in virus replication studies and plaque assays.Orf virus: The type species of PARAPOXVIRUS which causes a skin infection in natural hosts, usually young sheep. Humans may contract local skin lesions by contact. The virus apparently persists in soil.Cercopithecus aethiops: A species of CERCOPITHECUS containing three subspecies: C. tantalus, C. pygerythrus, and C. sabeus. They are found in the forests and savannah of Africa. The African green monkey (C. pygerythrus) is the natural host of SIMIAN IMMUNODEFICIENCY VIRUS and is used in AIDS research.Molecular Sequence Data: Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.Genome, Viral: The complete genetic complement contained in a DNA or RNA molecule in a virus.Cell Line: Established cell cultures that have the potential to propagate indefinitely.