I understood it that the normal progres for trialing vaccines is in stages one following another, this takes time, but because of the extreme urgency for this vaccine all of the trial stages took place at the same time, therefore allowing the vaccine to be produced in a much speedier fashion, but that all the necessary trials were passed nonetheless, therefore the speed of production is not something to be overly concerned about. Regarding unvaccinated staff… of course all staff could possibly pass on Covid , however unvaccinated staff would most likely have a much higher viral load and therefore would be more of a danger to patients, correct me if I have misunderstood this.