Northwestern Medicine seeks 5,000 volunteers for COVID-19 vaccine trials Jul 28, 2020 | coronavirus, Hospitals, Top Stories Northwestern Medicine is seeking 5,000 Chicago-area volunteers to join a registry for COVID-19 vaccine trials.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.