Influenza B Virus

**Semantic type:** Virus

**Definition:** A negative-strand linear single-strand RNA virus with an 8 segment genome. Virions are enveloped and usually spherical or pleomorphic, 50-120 nm in diameter. Influenza B viruses are usually found only in humans. Unlike influenza A viruses, these viruses are not classified according to subtype.

**Synonyms:** - FLUBV - INFLUENZA B VIRUS - INFLUENZA B VIRUS WHOLE - Influenza B - Influenza Type B - Influenza Virus Type B