AstraZeneca’s Covid-19 Vaccine Is Found to Be 79% Effective in U.S. Study March 23, 2021 Auto Bot AstraZeneca PLC, Clinical Trials, Coronavirus (2019-nCoV), Food and Drug Administration, Great Britain, United States, Vaccination and Immunization 0 The company is preparing to apply for emergency authorization from the Food and Drug Administration. But the shot may not be needed in the United States.