Monthly cumulative influenza vaccination coverage data tracks the percent of children and adults receiving one or more flu vaccine doses across U.S. jurisdictions. Estimates are derived from Immunization Information Systems data submitted by jurisdictions to the CDC, with comparisons between the 2025–26 season and three prior seasons. The dataset was last updated in March 2026.
Use Cases
- Analyze monthly trends in vaccination coverage by comparing `Current_season` and `Previous_Estimate` columns across different `Jurisdiction` and `Age_group_label`.
- Identify jurisdictions with significant coverage changes using the `Difference_indicator` and `Difference_in_season_estimate` fields.
- Compare vaccination rates between `Child_or_adult` groups for specific `Month`s within a flu season.
- Assess the relationship between raw vaccination counts (`Numerator`) and coverage percentages relative to the `Population` denominator.
Strengths
- Provides direct comparison between the current flu season and three previous seasons via the `Previous_flu_Season` and `Difference_in_season_estimate` columns.
- Includes data disaggregated by `Jurisdiction`, `Age_group_label`, and `Child_or_adult` categories for granular analysis.
Limitations
- National estimates are not provided as not all U.S. jurisdictions report data to the CDC.
- Sample size and row count are unknown, limiting assessment of statistical power.
Provenance
- Source
- Centers for Disease Control and Prevention (CDC) via data.cdc.gov.
- Collection Method
- Aggregated from U.S. jurisdictions' Immunization Information Systems (IIS) data submitted monthly to the CDC.
- Time Range
- Covers flu seasons from July 1 through each month, with comparisons to three previous seasons.
- Freshness
- Updated monthly; last updated March 2026.
- Geography
- United States, reported by jurisdiction (states, some localities, and territories).