Efforts by the British and French drugmakers GSK and Sanofi Pasteur to produce a Covid-19 vaccine have suffered a further setback, with final clinical data on the jab and a potential launch delayed until next year as they struggle to find enough uninfected people to test it on.
The two vaccine specialists announced positive preliminary results from a trial that showed the vaccine raised antibody levels against Covid by nine to 43 times when given as a single booster shot in people who had already
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