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AstraZeneca says trial data from U.S. study on its COVID-19 vaccine shows it's 79% effective

AstraZeneca says advanced trial data from a U.S. study on the COVID-19 vaccine it developed along with Oxford University shows it is 79% effective in preventing symptomatic illness and 100% effective against severe illness and hospitalization. Dr. David Agus joined "CBS This Morning" to explain more.
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