are very

"People are very keen on at the moment on that graph in the Pfizer paper in the New England Journal of Medicine where they show that there must be some kind of de facto benefit as early as something like day 14," says Altmann. "It's the one where the curve for the placebo group and the vaccine group completely diverge, and cases start taking off in the placebo group. But obviously that's not measuring an immune response directly – it's using quite a crude measure of how many people have been infected." Altmann explains that he wouldn't advise anyone to consider themself safe 14 days after their first dose of the vaccine. "The graph is just a way of saying 'something is happening'," he says.

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