UK could get Novavax vaccine by SUMMER: Jab which is 89% effective against Kent variant and 'can be adapted to new strains' could be submitted for approval in two weeks and in Britain within months, clinical trial chief reveals Trial results showed it was 89.3 per cent effective against coronavirus and the Kent variant of the virus And 60 per cent effective against South African strain which has sparked concern among many scientists Professor Paul Heath, who led trials, said today they may be able to conclude their trial within two weeks He added results against the South African strain were 'really good' and may be replicated by other jabs