U.S. Influenza Vaccination Coverage by Age, Race, and Geography

Influenza vaccination coverage data from the National Immunization Survey-Flu and Behavioral Risk Factor Surveillance System. The dataset includes estimates, confidence intervals, and sample sizes at national, regional, and state levels. It is published by data.cdc.gov and was last updated on January 20, 2026.

Use Cases

• Analyze vaccination disparities by race/ethnicity using the `Dimension` and `Dimension Type` columns.
• Model state-level vaccination trends over time using `Geography`, `Month`, and `Season/Survey Year`.
• Assess estimate reliability by comparing `Estimate (%)` with its `95% CI (%)` and `Sample Size`.
• Map vaccination coverage at the county level by joining on the `FIPS` code column.

Strengths

• Data is sourced from two established federal surveys: NIS-Flu and BRFSS.
• Includes statistical confidence intervals (`95% CI (%)`) and `Sample Size` for each estimate.
• Offers multiple geographic granularities (`Geography Type`) including state and national levels.
• Available in multiple machine-readable formats including CSV, JSON, XML, and RDF.

Limitations

• Row count and total dataset size are unknown, which may limit suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

data.cdc.gov, aggregating data from the National Immunization Survey-Flu (NIS-Flu) and the Behavioral Risk Factor Surveillance System (BRFSS).

Collection Method

Survey data collection via NIS-Flu and BRFSS.

Time Range

Temporal coverage is implied by the `Season/Survey Year` and `Month` columns but specific range is not stated.

Freshness

Last updated 2026-01-20 17:19:33; freshness should be verified.

Geography

Coverage includes national, regional, and state levels within the United States, as indicated by `Geography` and `Geography Type`.