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Doesn't sound great.
Serious question: why not? Lots of vaccines have a protocol that calls for multiple doses and/or booster shots.
(Edit: if we're talking about the one-shot efficacy not sounding great, then there's a logistics trade-off; the Oxford vaccine doesn't require extreme cold storage, so swings and roundabouts...)
So the Oxford vaccine has an efficacy of 62% when administered the way they planned it. It was only by mistakenly giving a group of participants a first half dose that efficacy rose to 90%. Doesn't sound great.
Can we choose which of the vaccines to get?