Respiratory Illness Data
Weekly Surveillance Summary
Key Points, updated 8/1/2025
- Overall acute respiratory illness activity level in Chicago remains Minimal, but with signs of increasing COVID-19 activity. National data suggest epidemic growth in Illinois and surrounding states.
- ED visits, hospitalizations, and ICU admissions for flu, RSV, and COVID-19 remain low across all age groups. However, ED visits for COVID-19 have been gradually increasing over the last 4 weeks.
- COVID-19 test positivity has increased over the past five weeks and is currently 4.3%. This is the highest level since March 2025. Test positivity rates for flu and RSV are unchanged and remain low.
- Overall wastewater concentrations for COVID-19 increased from Minimal to Low. RSV concentrations remain Minimal. Flu A concentrations decreased from Low to Minimal and Flu B concentrations remain Low.
- Parvovirus B19 (B19) activity has been increasing in Chicago and across the US. For information and guidance, see the July 10 Health Alert.
Respiratory Illness Dashboard
The Respiratory Illness Dashboard below summarizes information about respiratory virus disease activity in Chicago, with a focus on COVID-19 (caused by the SARS-CoV-2 virus), influenza, and respiratory syncytial virus (RSV). The dashboard will be updated every Friday at 1 p.m.
Additional Respiratory Illness Data
Find CDPH’s weekly surveillance report that tracks influenza, COVID-19, RSV, and other viral respiratory disease activity in Chicago.
Find information about how respiratory viruses are monitored in Chicago’s wastewater.
Learn more about how CDPH and the CDC are using genomic testing to monitor changes in diseases in Chicago.
Browse surveillance datasets that are available for download on the Chicago Data Portal.
Access health data for Chicago and your community.
The archived COVID-19 Data Dashboard is available for historical reference.
Archived data reports
National and State Respiratory Illness Data
