Moderate severity, with h1n1 dominant and a vaccine that matched well.
ILI% nationally — percentage of outpatient visits for influenza-like illness, CDC FluView ILINet, Weeks 40–20.
Peak ILI% nationally for recent seasons — shows where 2023–24 sits in the broader historical picture. Bar length = peak severity.
Share of positive flu tests by type, aggregated across the full season from CDC clinical laboratory data (national).
Peak ILI activity by HHS region across the 2023–24 season — regions sorted by severity.