I think what is really needed is data on Brazil and SA variants against the oxford vaccine (other vaccines too) for hospitalization and death.
- they just don't have this yet which is the problem.
If still catch it and a bit cold/flu unwell for a day or two and that's it. Then happy days! Think gov will be like, "play on"
If results in serious disease then, well, f***
I suspect will prevent severe disease but not 100%. Also think oxford could have new jab that covers the Brazil and SA changes in spike protein by end April. But are under promising. (They said end of Jan was starting work on it)
To get a tweak vaccine approved requires a hundred or so volunteers to get it. Then they measure immune response and make sure it is at right level - so pretty quick compared to first time around which was testing the whole vaccine and delivery method to be safe.