Monthly Cumulative Influenza Vaccination Coverage by U.S. Jurisdiction

Monthly cumulative estimates of persons receiving at least one influenza vaccine dose, aggregated by U.S. jurisdiction and age group. Data is sourced from Immunization Information Systems (IIS) reported by state, territorial, and local public health agencies to the CDC. It includes comparisons between the 2023-2024 season and two previous flu seasons.

Use Cases

• Analyze monthly vaccination trends by `Jurisdiction` and `age_group_label` to identify geographic and demographic coverage gaps.
• Compare `2023_24_estimate` with `previous_estimate` using the `difference_indicator` to assess year-over-year changes in coverage.
• Estimate population-level vaccination rates by calculating coverage percentages from `2023_24_numerator` and `population` columns.
• Segment analysis by `child_or_adult` to compare pediatric and adult influenza vaccination uptake across different seasons.

Strengths

• Data represents actual vaccination administrations from jurisdictional Immunization Information Systems, not survey samples.
• Includes comparisons across three flu seasons (2023-2024 and two previous seasons) for trend analysis.
• Aggregated by `Jurisdiction`, `age_group_label`, and `month` for multi-dimensional breakdowns.

Limitations

• National estimates are not provided as not all U.S. jurisdictions report data to the CDC.
• Data completeness and quality vary by jurisdiction due to differing state laws on IIS reporting.
• Coverage may be underestimated in some areas due to incomplete IIS data, as noted by the CDC.

Provenance

Source

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

Collection Method

Aggregated from U.S. jurisdictions' Immunization Information Systems (IIS) submitted to the CDC monthly.

Time Range

Covers monthly data from July through the reporting month for the 2023-2024 influenza season, with comparisons to two prior seasons.

Freshness

Updated monthly; last update was 2024-09-03.

Geography

United States, reported by jurisdiction (states, some localities, and territories).