Should we deliberately infect people with Covid-19 to get a vaccine‪?‬ Making the Call

Part one of our 3-part series on vaccines:  Human Experiments.
Experts say the development of a safe and effective vaccine will take at least a year, maybe a lot longer. What are we willing to risk to speed that up? Thousands of healthy people have already volunteered to be deliberately infected with the Coronavirus in order to test potential vaccines. Is that ethical?