LONDON, United Kingdom (AFP) — British drugs group AstraZeneca and the University of Oxford on Monday said their jointly-developed vaccine against Covid-19 has shown “an average efficacy of 70 percent” in trials. “This vaccine’s efficacy and safety confirm that it will be highly effective against Covid-19 and will have an immediate impact on this public health emergency,” AstraZeneca chief executive Pascal Soriot said in a statement. The results ranged between 62 and 90 percent efficacy […]