A viral infectious disease caused by RNA viruses in the Arenaviridae, Bunyaviridae, Filoviridae, or Flaviviridae family, and characterized by a severe multisystem syndrome, with damage to the vascular system and hemorrhaging. The disease is viral hemorrhagic fever (MONDO_0018087). Also known as: VHF, VHFs, haemorrhagic fevers, viral, viral haemorrhagic fever.