Another option is a trial where everyone gets a vaccine. Each patient is randomized to get one of multiple vaccines. That should provide better evidence about the relative desirability of each vaccine. I’m pretty sure that we ought to want to focus on which vaccines are best, not on whether vaccines meet some pre-defined standard of effectiveness.
Another option is a trial where everyone gets a vaccine. Each patient is randomized to get one of multiple vaccines. That should provide better evidence about the relative desirability of each vaccine. I’m pretty sure that we ought to want to focus on which vaccines are best, not on whether vaccines meet some pre-defined standard of effectiveness.