AstraZeneca's COVID-19 vaccine demonstrated 79 percent efficacy at preventing symptomatic COVID-19 and 100 percent efficacy at preventing severe disease and hospitalization in its U.S. phase 3 trial, the drugmaker said March 22.
The trial involved 32,449 participants, about 20 percent of whom were age 65 and older and about 60 percent of whom had comorbidities linked to an increased risk for progression of severe COVID-19. The vaccine was well tolerated, and its efficacy was consistent among all age and ethnicity groups.
AstraZeneca's vaccine is authorized for emergency use in dozens of countries. The drugmaker is expected to apply for FDA emergency approval within weeks.
The U.S. has ordered 300 million doses of AstraZeneca's vaccine.
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