You may be right. Although That’s not how I interpreted the story - on sky news app tonight, if interested
What we know from a clinical study is... if you take everything from day zero, the moment you get the vaccine, to day 28 then the overall figure is something like 50% protection," Sir Patrick said.
"But, of course, you don't expect to get any protection in the first 10 days, because it hasn't had a chance for the immune system to build up.
"And some people may have been infected before they had the vaccine.
"So, if you take from day 10 up towards day 21 and beyond, then it looks much more like the 89% figure that the Joint Committee on Vaccination and Immunisation said.
"That's the clinical trial data and we also know that when you get into real world practice, things are seldom quite as good as clinical trial.
"So I think the 89% or so is the figure you see post-10 days, so that's the basis of the recommendation.
It probably won't be as high as that in practice, but I don't think it will be as low as the figures you've just given."