Weekly Respiratory Illness Visits in Illinois Hospitals and Clinics
Updated 3mo ago
4filesCSV
Available on 1 platform
Sign in to view source links and access this dataset
Description
Aggregated weekly data tracks the percent of emergency department visits, inpatient admissions, and outpatient visits due to influenza-like illness (ILI), COVID-19, influenza, RSV, and acute respiratory illness. The Illinois Department of Public Health collects data from all 185 acute care hospitals in the state. Data is also reported by outpatient clinics in Chicago participating in the CDC's ILINet network.
Use Cases
Analyze weekly trends in the percent of emergency department visits for COVID-19 and influenza across different age groups.
Compare the percent of hospital inpatient admissions due to RSV and acute respiratory illness across demographic groups including race/ethnicity.
Model the correlation between outpatient ILI visit percentages from ILINet clinics and broader hospital-based syndromic surveillance data.
Track the co-circulation of multiple respiratory pathogens (ILI, COVID-19, influenza, RSV) using weekly percent visit data from Illinois hospitals.
Strengths
Data is collected from all 185 acute care hospitals in Illinois, ensuring comprehensive statewide coverage for emergency department and inpatient metrics.
Includes syndromic surveillance for five specific respiratory illness categories: ILI, COVID-19, influenza, RSV, and acute respiratory illness.
Provides demographic breakdowns including age group and race/ethnicity for selected data.
Integrates two surveillance systems: hospital-based ESSENCE data and outpatient ILINet clinic data.
Limitations
Data is aggregated to weekly percentages, preventing analysis at the individual patient or daily level.
All data are provisional and subject to change, which may affect the reproducibility of analyses.
Outpatient data is limited to clinics in Chicago participating in ILINet, which may not be representative of the entire state.
Provenance
Source
Illinois Department of Public Health (IDPH) and City of Chicago, via CDC's BioSense Platform and ILINet.
Collection Method
Syndromic surveillance using diagnostic codes and clinical terms from hospital electronic health records and outpatient clinic reports.
Time Range
Weekly data; specific start date not provided in input.
Freshness
Data was last updated on March 22, 2026, indicating regular maintenance.
Geography
State of Illinois for hospital data; City of Chicago for outpatient ILINet data.
Data is provisional and subject to change. Numbers may differ from other public sources. Requires understanding of syndromic surveillance definitions for the specific illness categories.