Medical Definition of Flaviviridae
: a family of single-stranded RNA viruses that have a spherical virion with a capsid composed of a single protein and a lipid envelope containing two or three proteins and that include the causative agents of hepatitis C, dengue, Japanese B encephalitis, Saint Louis encephalitis, West Nile fever, yellow fever, bovine viral diarrhea, and hog cholera—see flavivirus, pestivirus
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