https://www.siliconvalley.com/2020/11/23/astrazeneca-covid-19-vaccine-shown-to-be-highly-effective/ > By DANICA KIRKA and JILL LAWLESS | The Associated Press > LONDON  — AstraZeneca said Monday that late-stage trials showed its coronavirus vaccine was up to 90% effective, giving public health officials hope they may soon have access to a vaccine that is cheaper and easier to distribute than some of its rivals.