We still don't know which hole the novel coronavirus climbed out of. But it's done more damage than any of the coronaviruses that came before it. Now, knowing everything we do, is it fair to pin our hopes on a vaccine? Who stands first in line, and who gets to make those decisions? Is a vaccine that's been put through a "fast-tracked trial" safe to use? Do "immunity boosters" really work against this new threat? 

We speak to Professor Anant Bhan, a bioethicist and global health and policy expert, to understand some of the big questions still on people's minds.