It's impossible unfortunately to test a vaccine against a particular strain as the vaccines don't kill the virus so this can't be tested for example in a lab. The vaccines teach the body to deal with an infection and so the only way to find out effectiveness is to vaccinate people and then send them out to live their lives. You then compare how many vaccinated people get sick or test positive compared to unvaccinated people.SAGE or Public Health England should take all the approved vaccines and test them against the SA like variants. We have assumed that we have to keep the variant in check through lockdown / quarantine / testing etc until a new vaccine is developed by Oxford / Pfizer etc but what if there is another approved vaccine that functions quite well against it? I would look at the Chinese vaccines because at least one of them is a whole virus vaccine and theoretically, it should be less affected by mutations to the spike protein. There's also Novovax, to which the UK has an order, but has yet to be approved by the MHRA, which claims 60% effectiveness against the SA variant.
Why is everyone assuming we are completely reliant on one vaccine or vaccine type when there are alternatives?
I can see a situation developing where we might all end up having several vaccines over the coming years depending on how the variants change. It really is a very dynamic and difficult situation because of the fact that COVID-19 has never been encountered before but that will slowly change.
In Israel they monitored 750,000 vaccinated people and only 38 people have ended up in hospital with COVID, none have died. We should be very confident in the vaccines and the science because all of the evidence so far suggests the vaccines work very well. There is nothing to suggest that any existing variant will be problematic.
The critical thing for anyone when they get vaccinated is to be very cautious afterwards. It takes 3 weeks to build immunity and there is an increasing number who are catching COVID because they think they are immune right after their vaccination.