Linked from
The 5 pages that link to Influenza B virus, each with the reason it gives.
Influenza vaccineBroader topic: Seasonal vaccines also target influenza B lineages.
Antigenic driftRelated: Its lineages also drift, though they do not undergo antigenic shift.
InfluenzaBroader topic: It contributes to seasonal influenza but is not known to cause pandemics.
RimantadineCompared with: Rimantadine’s activity against influenza A did not extend to influenza B.