Influenza B viruses are not divided into subtypes, but can be further broken down into lineages and strains.
Influenza B/Victoria is a lineage viruses of influenza virus that can cause respiratory, fever and stomach symptoms.
|HA1||The hemagglutinin (HA) is the principal antigen in inactivated influenza vaccines and the target of protective antibodies. HA is a major envelope glycoprotein with a length of approximately 560 amino acid residues, which is subsequently cleaved into two subunits, HA1 and HA2.The HA1 subunit forms a membrane-distal globular head that contains the receptor-binding site and most of the highly variable immunodominant antigenic regions recognized by neutralizing antibodies|
|NA||The neuraminidase (NA) is envelope glycoprotein, and is involved in the process of new virions budding out of host cells. NA has enzymatic activity, and is the target for the antiviral drugs, thus slowing down the release of progeny virus from infected cells.|