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Related to Influenza B virus: influenza virus, Influenza C virus
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NB of influenza B virus also shows structural similarities with M2 of influenza A virus, including ion channel activity (39), and has an 18-aa-long ectodomain.
The influenza B virus nonstructural NS1 protein is essential for efficient viral growth and antagonizes beta interferon induction.
Current influenza virus vaccines consist of 3 components: an H1N1 (hemagglutinin [HA] subtype 1; neuraminidase [NA] subtype 1), an H3N2 influenza A virus, and an influenza B virus.