trial on the Oxford-AstraZeneca vaccine has found it was 100% effective at preventing serious disease.US researchers gave 32,000 volunteers - a fifth aged over 65 - two doses of the jab, four weeks apart.They found none had to go hospital and only 141 developed symptoms afterwards - suggesting the vaccine was 79% effective at stopping illness in those vulnerable to the virus.Andrew Pollard, the lead investigator of the Oxford University trial of the vaccine, said: "These results are great news as they show the remarkable efficacy of the vaccine in a new population and are consistent with the results from Oxford-led trials."We can expect strong impact against Covid-19 across all ages and for people of all different backgrounds from.
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