By Sue Danielson Jan 8, 2021 (Iowa City, IA) -- University of Iowa Health Care is taking part in COVID-19 vaccine trial. Researchers are testing a vaccine by Novavax. The multi-site clinical trial aims to enroll 30-thousand people, 250-in Iowa. Participants will get two doses of the vaccine, 21-days apart. “Different types of vaccines are helpful because certain people might respond better to one type of vaccine than another,” says Patricia Winokur, MD, executive dean of the University of Iowa Carver College of Medicine, and principal investigator for the UI trial site for the Novavax vaccine. Winokur also led the UI site for the clinical trial of the Pfizer-BioNTech vaccine.