Weekly Adult Influenza Vaccination Coverage Estimates By U.S. Jurisdiction

Weekly estimates of influenza vaccination coverage and intent among adults aged 18 years and older are provided by U.S. jurisdiction. Data originates from the CDC's National Immunization Surveys-Fall Respiratory Virus Module, a random-digit-dial cellular telephone survey. The dataset is updated weekly, with a noted processing lag of a few days behind primary data channels.

Use Cases

• Compare Curr_estimate and Past_estimate between Curr_season and Past_season to analyze year-over-year vaccination coverage changes by Geography_Name.
• Analyze Estimate_Difference and its associated confidence intervals (Diff_CI_95) to identify jurisdictions with statistically significant (Significance) changes in coverage.
• Track vaccination progress weekly using the Current_Season_Week_Ending_Date and Month_Week fields for temporal trend analysis.
• Assess geographic disparities by grouping coverage estimates (Curr_estimate, Past_estimate) by the Geographic Level field (e.g., state, region).

Strengths

• Data is updated weekly, providing near-real-time surveillance.
• Includes confidence intervals (Curr_CI_HalfWidth, Past_CI_HalfWidth) and significance testing (Significance) for statistical reliability.
• Provides comparative analysis between two consecutive influenza seasons (2025-26 and 2024-25).

Limitations

• All estimates are based on self-reported vaccination data, which is subject to recall bias.
• Sample size and row count are unknown, limiting assessment of statistical power.
• Data publication lags a few days behind primary CDC channels, as noted in the description.

Provenance

Source

Centers for Disease Control and Prevention (CDC) via data.cdc.gov.

Collection Method

Data gathered via the National Immunization Surveys-Fall Respiratory Virus Module (NIS-FRVM), a random-digit-dial cellular telephone survey.

Time Range

Covers the 2024-25 and 2025-26 influenza seasons, updated weekly.

Freshness

Weekly updates; last updated 2026-03-04.

Geography

United States, aggregated by jurisdiction (Geography_Name).