1. A family of arboviruses composed of more than 200 virus serotypes and containing at least five genera: Bunyavirus, Hantavirus, Phlebovirus, Nairovirus, and Tospovirus. Virions in all genera except Hantavirus replicate in arthropods. Virions are 80–120 nm in diameter, sensitive to lipid solvents and detergents, and enveloped with glycopolypeptide surface projections; the nucleocapsid is of helical symmetry containing three molecules of single-stranded RNA (MW 5–8 × 106).

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