What he said20 Oct 2020 13:26
A safe, fully approved, and meticulously controlled human challenge model for COVID-19 that is conducted by experienced experts may help in the search for safe and effective vaccines.
First, for the many vaccines still in the mid-stages of development, human challenge studies may help pick out the most promising ones to take forward into larger Phase III trials.
Second, for vaccines which are in the late stages of development and already proven to be safe and effective through Phase III studies, human challenge studies could help us further understand if the vaccines prevent transmission as well as preventing illness.