I think it’s worth saying that although a vaccine is given a % of efficacy it doesn’t mean that only that % are protected.Interesting call.
1 jab gives around 65% efficacy for an unresearched/unstudied period of time, hence the need for 2 which is Pfizer`s 3 week "known factor".
However is it better that more people get that 65% or far fewer get 75%+ efficacy?
To add to the mix the base of the vaccine is a known factor that has been tweaked, it`s safe but the true level of protection isn`t fully understood.
We are, effectively, a mass clinical trial.
in the case of the Oxford vaccine in the trials no one who had the vaccine who then went on to be infected with COVID were hospitalised where as those who had the placebo 10 were hospitalised & 1 of them died.