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Flu

Cook County Department of Public follows the scienced-based vaccination recommendations of the Illinois Department of Public Health  for flu, COVID-19, flu and RSV vaccinations. Access more details about our vaccination guidance to prevent respiratory illnesses here .

For other routine, non-seasonal, vaccinations, we follow the recommended vaccination schedule of the American Academy of Pediatrics  as well as the CDC adult immunization schedule  and the CDC youth immunization schedule  from Aug. 7, 2025.

Get free flu and COVID-19 vaccinations at our Saturday vaccination clinics.

About Flu

Flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs. It can cause mild to severe illness, and at times can lead to death.

Prevention

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Fact sheets about Flu (PDF)

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  • Other Languages (Coming Soon)

Updated October 15, 2025, 9:52 AM