We already knew that the Covid-19 variant first discovered in south-east England was more transmissible, but now – speaking at a Downing Street briefing – Prime Minister Boris Johnson has revealed it

may also “be associated with a higher degree of mortality”. On how much more deadly the UK strain might be, the UK’s chief scientific adviser, Sir Patrick Vallance, said if the old variant might lead to the deaths of 10 in 1,000 men in their 60s who caught the virus, the new variant might kill 13 or 14 in 1,000. However, he added: “There’s a lot of uncertainty around these numbers and we need more work to get a precise handle on it.”

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