BBC News
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Scientists say signs a new coronavirus variant is more deadly than the earlier version should not be a "game changer" in the UK's response to the pandemic.
Boris Johnson has said there is "some evidence" the variant may be associated with "a higher degree of mortality".
But the co-author of the study the PM was referring to said the variant's deadliness remained an "open question".
Another adviser said he was surprised Mr Johnson had shared the findings when the data was "not particularly strong".
A third top medic said it was "too early" to be "absolutely clear".