Respiratory Illness Data
Weekly Surveillance Summary
Key Points, updated 7/11/2025
- 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, in the past two seasons, COVID-19 test positivity has tended to rise during the summer months. Refer to the Respiratory Illness Dashboard for updates.
- Wastewater concentrations for Influenza and COVID-19 remain minimal. RSV concentrations decreased from low to minimal.
- 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
National and State Respiratory Illness Data



