United States weekly cumulative influenza vaccination coverage estimates for children aged 6 months to 17 years. Data originates from the CDC's National Immunization Survey-Flu, a national random-digit-dialed cellular telephone survey conducted from October to June. The dataset includes weekly updates for the 2025–26 season with comparisons to previous seasons.
Use Cases
- Analyze weekly trends in vaccination coverage (`curr_est`) by jurisdiction (`geographic_name`) and demographic group (`demographic_name`).
- Compare current season (`curr_season`) vaccination rates against past seasons (`past_season`) using the difference estimate (`Difference_Estimate`) and significance indicator (`Significance`).
- Assess statistical confidence in coverage estimates using the provided 95% confidence intervals (`curr_CI_95`, `past_CI_HalfWidth`).
- Track vaccination progress over time using the week-ending date columns (`Current_Week_Ending_Date`, `Previous_Week_Ending_Date`).
Strengths
- Data is updated weekly, with the last update recorded on 2026-03-25.
- Includes statistical confidence intervals (`curr_CI_95`, `past_CI_HalfWidth`) for each coverage estimate.
- Provides direct season-to-season comparisons (`Difference_Estimate`, `Significance`) for trend analysis.
Limitations
- All estimates are based on parental report, which may introduce recall bias.
- Data is described as being a few days behind the primary CDC data channel due to review processes.
- The exact sample size (row count) and historical time range are not specified in the provided metadata.
Provenance
- Source
- Centers for Disease Control and Prevention (CDC) via the National Immunization Survey-Flu (NIS-Flu).
- Collection Method
- National random-digit-dialed cellular telephone survey of households with children, with a parent or guardian as respondent.
- Time Range
- Survey conducted October-June annually; dataset includes the 2025–26 season and comparisons to previous seasons.
- Freshness
- Weekly updates.
- Geography
- United States, with data available by jurisdiction (`geographic_name`).