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A family of enveloped single-stranded positive sense RNA viruses 40-60 mm in diameter formerly classified as the "group B" arboviruses, including yellow fever and dengue viruses; maintained in nature by transmission from arthropod vectors to vertebrate hosts.
Flaviviridae/Fla·vi·vi·ri·dae/ (fla″vĭ-vir´ĭ-de) the group B arboviruses: a family of RNA viruses with a single-stranded positive-sense RNA genome; there is a single genus, Flavivirus.
FlaviviridaeVirology A large group of small viruses that have their entire life cycle in cytoplasm, without an intermediate DNA form Examples Dengue, Omsk hemorrhagic, St Louis encephalitis, West Nile, yellow fever viruses
a family of viruses comprising three genera, Flavivirus, Pestivirus, and Hepacivirus. They are single-stranded, plus sense RNA viruses. The type species of the genus Flavivirus, which are arthropod borne viruses, is the yellow fever virus of humans (flavi = yellow); other viruses cause encephalitis in humans and some cause encephalitis in animals. Amongst the viruses in the genus which affect animals are: West Nile virus, St. Louis encephalitis—a disease of humans but the virus has been isolated from animals; Japanese B encephalitis virus; California encephalitis of humans, but viremia detectable in feral animals; louping ill; Central European tickborne fever and Murray Valley encephalitis, both diseases of humans and the viruses that occur in small ruminants; wesselsbron disease, Israeli turkey meningoencephalitis; Powassan disease; and the Tahyna virus. The genus Pestivirus includes classical swine fever (hog cholera), bovine virus diarrhea-mucosal disease and ovine border disease viruses. The genus Hepacivirus includes human hepatitis C virus. Pestiviruses and hepaciviruses are not arthropod borne.