WORLDAstraZeneca Covid 19 Vaccine Shows 79% Efficacy in US Phase 3 TrialadminMarch 22, 2021March 22, 2021 March 22, 2021March 22, 2021 AstraZeneca plc’s covid-19 vaccine, the company said that the jab showed an efficacy of 79 per cent in phase 3 trials in the US, Chile...