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Is it as much of a fact as you think it is though? How do you prove that the vaccine wasn't 79% effective the whole time and the reason why it initially appeared 95% effective is because there was less virus circulating during the initial trial? And that trial was only 40k people compared with millions with whom we're currently getting post administration data from now?
I think the consensus is that the vaccine was 95% effective against the original alpha strain, but the vaccines are less effective against the delta variant. COVID alpha has all but died out, and now everyone has delta. So the vaccines look less impressive than they did, but they did their original job as advertised. Boosters can make the vaccines almost as effective against delta as they were against alpha, and that's the main reason for recommending them. Not some idea of waning immunity.
I don't think anyone has any clue if natural immunity or vaccine immunity wanes or how quickly. Nearly all the reinfections and breakthroughs are first alpha then delta. So we may all have lifelong immunity to alpha for all we know, but it won't matter because it's gone. For now all that matters is immunity to delta.
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