Currently there are two co-circulating lineages of the Influenza B virus termed B/Yamagata/16/88-like and B/Victoria/2/87-like viruses.
Currently there are two co-circulating lineages of the Influenza B virus based on the antigenic properties of the surface glycoprotein hemagglutinin. The lineages are termed B/Yamagata/16/88-like and B/Victoria/2/87-like viruses.