Copyright: PA Media
Professor Neil Ferguson, a senior scientific adviser whose modelling prompted the first UK lockdown last year, says data on vaccine effectiveness and how quickly infection, deaths and hospital cases were declining was "looking promising".
Prof Ferguson, from Imperial College, London, tells BBC Radio 4's Today programme: "The trade-off we have is between how quickly can we relax, and how quickly we can immunise and protect the population.
"There's still risks, at the moment, in relaxing too quickly when we don't have enough immunity in the population - bearing in mind that... no vaccine will offer perfect protection."
He says the emerging picture on the "real-world effectiveness" of vaccines is also looking promising, but there is not yet sufficient data to offer a conclusive answer.
"We have quite a lot of data, " he says, thanks to figures from Israel and the UK. But he adds: "It's still early days though... it takes quite a long time to collect the data needed."
Nonetheless, he says media reports suggesting a figure of two-thirds efficacy from a single dose of a vaccine are "not too far off".
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2021-02-19 08:48:45Z
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