Respiratory Illness Data
Weekly Surveillance Summary
Key Points, updated 7/25/2025
- Overall acute respiratory illness activity level in Chicago remains Minimal. Flu, COVID-19 and RSV activity all remain Minimal.
- ED visits, hospitalizations, and ICU admissions for flu, RSV, and COVID-19 remain low across all age groups.
- Test positivity rates for influenza, RSV, and COVID-19 remain low. However, COVID-19 test positivity has increased over the past four weeks, and national data suggest epidemic growth in IL and surrounding states.
- Wastewater concentrations for Influenza A increased from minimal to low; RSV and COVID-19 remain minimal. Wastewater concentrations for Influenza B are low.
- The CDC has issued interim estimates of 2024-25 Seasonal Influenza Vaccine Effectiveness (VE) and 2024-25 COVID-19 VE, which suggest that this season’s influenza and COVID-19 vaccines were effective in preventing medically-attended illness, including hospitalization, in the US.
- For information on the national bird flu outbreak, see the CDPH H5N1 Bird Flu webpage and the CDPH HAN: Flu Page for clinicians.
- Parvovirus B19 (B19) activity has been increasing in Chicago and across the US. For more 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The archived COVID-19 Data Dashboard is available for historical reference.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
