AstraZeneca expects results from its US coronavirus vaccine trials within six WEEKS - and data suggests the Oxford-designed shot DOES work against UK 'super-covid' AND reduces transmission AstraZeneca could finish its US trials for its 70% effective vaccine in four to six weeks, said firm research chief Mene Pangalos on Friday Data that has not been reviewed suggests the shot is equally effective at preventing symptomatic infection from the UK's 70% more infectious variant UK officials also said early data suggests it works as well in people over 65 as it does in younger people, after previous data suggested reduced efficacy The Oxford-designed shot is the first to show a measured effect on transmission