However, the efficacy of this vaccine (and all the other candidates) still needs to be clarified - ie is it like a measles vaccination (~90% efficacy) or the flu vaccines (~ 25% - 50% I believe).
- Efficacy of at least 60%
- Lower bound of efficacy (confidence interval) >= 30%
- Minimum safety data for at least one or two months post vaccination (I don't remember if it's one or two)
- At least five severe cases in the control arm
- Requirements for the trials to go on even if efficacy is found for an additional year after the trial end (for most of the trials, this means two years in total)