Psoriasis Covid Vaccine

[Caroline]

The only thing that concerns me is that the  construction of the Pfizer vaccine is a type,as I understand, that has never been approved or used before.
I think that I prefer the Oxford one as the construction of that is similar to existing types.

That is not entirely true Dave.
A very long time ago, in the time before the antibiotics were discovered (because that is a discovery, not a development, and in fact more scary than a vaccine), people used a so called blood therapy which worked against specifically bacterial problems. They did not know in that time, but the now we understand the reason that it worked and that is because this therapy showed the DNA to the immune system, which then reacted by making the correct anti bodies.
This Pfizer vaccine works in the same way, but with RNA. The principle is the same.

But it's never been approved yet for use before .

For everything there is a first time.... and “approval” is a burocratic process that has nothing to do with real physical life. Nature goes on without any “approval”.