Influenza B is the predominant flu strain so far this season in the United States, which has seen an increase in the number of states reporting high flu activity, according to the CDC’s Weekly Flu Index for Nov 29..

Key findings of the report include:

  • Nationally, ILI activity has been at or above baseline for three weeks; however, the amount of influenza activity across the country varies with the south and parts of the west seeing elevated activity while other parts of the country are still seeing low activity.
  • There is significant cocirculation of influenza B/Victoria, A(H1N1)pdm09, and A(H3N2) viruses with the predominant virus varying by region and age group.
  • The flu season is just getting started. It’s not too late to get vaccinated. Flu vaccination is always the best way to prevent flu and its potentially serious complications.