Chicago COVID-19 Outcomes by Vaccination Status and Age

Weekly rates of COVID-19 cases, hospitalizations, and deaths for Chicago residents, segmented by vaccination status and age. The dataset tracks outcomes for fully vaccinated, boosted, and unvaccinated populations, with rates beginning in April 2021. Data originates from official Illinois immunization and disease surveillance registries.

Use Cases

• Compare weekly case rates between boosted and unvaccinated populations to assess vaccine effectiveness over time.
• Analyze hospitalization and death rate trends by age group within each vaccination status category.
• Model the impact of booster recommendations starting October 2021 on subsequent outcome rates.

Strengths

• Data is sourced from authoritative public health systems: the Illinois Comprehensive Automated Immunization Registry Exchange (I-CARE) and Illinois National Electronic Disease Surveillance System (I-NEDSS).
• Provides clear, operational definitions for key metrics like 'Cases', 'Hospitalizations', 'Deaths', 'Fully vaccinated', and 'Boosted'.
• Explicitly excludes partially vaccinated individuals, creating cleaner comparison groups for analysis.

Limitations

• Dataset is marked as historical-only and retired, meaning it is no longer updated with recent data.
• Individuals can be counted more than once for cases due to potential reinfections, complicating unique person-level analysis.
• Geographic scope is limited to Chicago residents, limiting generalizability to other regions.

Provenance

Source

City of Chicago, via Illinois I-CARE and I-NEDSS systems.

Collection Method

Aggregated from reported COVID-19 tests, hospital admissions, death records, and vaccination registry data.

Time Range

Weekly data from April 3, 2021 onward for vaccinated/unvaccinated; from October 23, 2021 for boosted.

Freshness

Last updated in May 2024, but dataset is retired and historical.

Geography

Chicago, Illinois, USA (based on patient home address).