New variant appears to cause less severe illness than previous versions of coronavirus, but seems to be more easily transmitted and is better at evading vaccines
Britain's PM says everyone over 18 to be eligible for COVID booster shot by end of December; health agency warns existing vaccines appear less effective against new variant
UN health agency cites data indicating infections from new variant are 'mild' or asymptomatic, predicts it will overtake Delta 'where community transmission occurs'
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