Chicago Influenza Vaccination Coverage by Demographics and Week

Weekly cumulative counts and coverage percentages of Chicago residents considered up to date with influenza vaccines, broken down by race-ethnicity, sex, and age group. The Chicago Department of Public Health (CDPH) estimates coverage using data from the Illinois Comprehensive Automated Immunization Registry Exchange (I-CARE) and population counts from the 2020 U.S. Decennial Census. Data is provisional and updated weekly, with the most recent update on 2026-03-22.

Use Cases

• Monitor weekly vaccination coverage trends based on reported demographic breakdowns.
• Analyze disparities in influenza vaccine uptake based on race-ethnicity, sex, and age group.
• Assess the impact of public health campaigns by tracking cumulative counts over the influenza season.
• Compare estimated coverage against population benchmarks, noting where counts may exceed 100%.

Strengths

• Data is updated weekly, with the last update on 2026-03-22.
• Coverage is calculated for specific demographic subgroups (race-ethnicity, sex, age).
• Population estimates are sourced from the 2020 U.S. Decennial Census.
• The description explicitly details calculation methods and data limitations.

Limitations

• Vaccination reporting is not mandatory for all providers in Illinois, likely causing underestimation.
• Coverage percentages are capped at 99%, and counts may exceed population estimates in small subgroups.
• Demographic information is reported by medical providers and may be incorrect.
• Row count and column-level documentation are unknown.

Provenance

Source

Illinois Comprehensive Automated Immunization Registry Exchange (I-CARE), U.S. Census Bureau 2020 Decennial Census

Collection Method

Reported by medical providers and aggregated by the Chicago Department of Public Health (CDPH).

Time Range

Influenza season defined as beginning of July (MMWR week 27) through the end of the following June (MMWR week 26).

Freshness

Last updated 2026-03-22 04:04:14.430706; data is provisional and updated weekly.

Geography

City of Chicago, based on the reported address of the vaccinated person.