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.Mononegavirales Infections: Infections with viruses of the order MONONEGAVIRALES. The concept includes FILOVIRIDAE INFECTIONS; PARAMYXOVIRIDAE INFECTIONS; and RHABDOVIRIDAE INFECTIONS.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.Genome, Viral: The complete genetic complement contained in a DNA or RNA molecule in a virus.Viral Proteins: Proteins found in any species of virus.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.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.RNA, Viral: Ribonucleic acid that makes up the genetic material of viruses.