Illinois, except Chicago and Cook County, to expand eligibility for COVID-19 vaccinations Ryan Voyles 4 years ago Illinois is set to expand COVID-19 vaccine eligibility to those over the age of 16 with certain high-risk comorbidities and underlying conditions.To access this content, you must purchase 1 Year Health News Illinois Subscription or 1 Year Group Subscription - Up to 5 Users, or log in if you are a member.