(Photo: Malaysia Atwater/The Stanford Daily). on January 26, 2021 Four people who volunteered to be injected with coronavirus to increase the speed of vaccine trials advocated for the use of human challenge vaccine trials during a Tuesday event. Volunteers Danica Marcos, Zacharia Kafuko, Aric Floyd and Seán McPartlin are members of 1Day Sooner, an organization that promotes the use of human challenge trials to speed up the deployment of effective COVID-19 vaccines. (The four haven’t been injected with coronavirus — yet.) In contrast to conventional trials that involve testing the effecti...