https://www.siliconvalley.com/2021/03/22/astrazeneca-vaccine-is-79-effective-against-symptomatic-covid-19-company-says/ > AstraZeneca’s Covid-19 vaccine showed 79% efficacy against symptomatic disease and 100% efficacy against severe disease and hospitalization in a new, US-based clinical trial, the company said Monday. > The findings from the new Phase 3 trial, which included more than 32,000 participants, may boost confidence in the vaccine, which was originally developed by the University of Oxford.