NOTE: This dataset is no longer being updated but is being kept for historical reference. For current data on respiratory illness visits and respiratory laboratory testing data please see Influenza, COVID-19, RSV, and Other Respiratory Virus Laboratory Surveillance and Inpatient, Emergency Department, and Outpatient Visits for Respiratory Illnesses.

This dataset includes aggregated weekly metrics of the surveillance indicators that the Department of Public Health uses to monitor influenza activity in Chicago. These indicators include:

• Influenza-associated ICU hospitalizations for Chicago residents, which is a reportable condition in Illinois (HOSP_ columns)

• Influenza laboratory data provided by participating sentinel laboratories in Chicago (LAB_ columns)

• Influenza-like illness data for outpatient clinic visits and emergency department visits. (ILI_ columns)

For more information on ILINET, see https://www.cdc.gov/flu/weekly/overview.htm#anchor_1539281266932.

For more information on ESSENCE, see https://www.dph.illinois.gov/data-statistics/syndromic-surveillance

All data are provisional and subject to change. Information is updated as additional details are received. At any given time, this dataset reflects data currently known to CDPH. Numbers in this dataset may differ from other public sources.