Prime Minister Boris Johnson says there is "some evidence" the UK Covid variant is associated with a "higher degree of mortality". <br /> <br />The government's chief scientific adviser, Sir Patrick Vallance, added the new strain appeared 30-70% more transmissible than the original virus. Report by Alibhaiz. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn
