https://gis.cdc.gov/grasp/fluview/flu_by_age_virus.html [cdc gov]

It’s cool to be able to visualize some of these patterns (influenza subtype, ages, number of patients per week), though there are patterns which may be deceiving (Is influenza A/H3’s spread among the elderly caused by greater susceptibilty, or is it just happening to be going strong in convalescent care homes?)