All recent flu seasons on the same week-by-week timeline — so you can see at a glance whether this year is running ahead of, behind, or on pace with the worst seasons in recent memory.
ILI% nationally — outpatient visits for influenza-like illness, normalized to the same seasonal calendar. Week 1 = first week of October.
Data: CDC FluView ILINet via Delphi CMU Epidata · wILI% (weighted influenza-like illness percentage) · Threshold lines: Moderate ≥3%, High ≥5%, Very High ≥8% · 2020–21 shown dashed (COVID precautions nearly eliminated flu that year)