Not sure I understand Badger. I had the Pfizer, so are we saying there is no evidence that the second after 12 weeks is actually worth it?
I have a vested interest in finding out more about this as it is the one my wife was given last week. I believe that, if given over a 3 week cycle, it will be as effective as Pfizer suggests, but no one knows how effective it will be if the gap between the two jabs is longer.
The USA and some EU countries have already stated that they will only give the Pfizer jab in accordance with Pfizer’s directions.
The tests during manufacturing showed efficacy, I believe, of 89% when given 3 weeks apart.
They don’t know what the efficacy would be if the gap was stretched, as it wasn’t researched.
The AZ vaccine is DNA based, whereas the Pfizer and Moderna vaccines are mRNA based (don’t ask me what this means) and according to a report in the Scientific American the DNA based vaccine is “hardier”, so it isn’t surprised that extending the gap doesn’t impact on it’s efficacy.
The link I posted last night to the Scientific American also touched on a small test on the Moderna vaccine that showed it’s efficacy dropped after a few months (particularly in people older than 56 years) so I think the fear is that, with the Pfizer also being mRNA based, this could potentially happen to the Pfizer vaccine. And if it does, what would be it’s efficacy after the second dose, if the efficacy after the first dose is not as high as advertised.
In tests done by the Israelis, on more than 200,000 people, they recorded the efficacy of the first Pfizer jab being just 33% and not 50%, so if that is the case, and the efficacy should drop over a few months, the second jab is working from a lower starting point, so the overall efficacy could be lower than advertised.
This is just my opinion based on what I have found and I would love someone to give me a link that shows my concerns to be groundless.