Doctor: This is the best news about the AstraZeneca vaccine

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Former Baltimore City Health Commissioner Dr. Leana Wen reacts to the results of a US-based clinical trial that the AstraZeneca Covid-19 vaccine showed 79% efficacy against symptomatic disease.Former Baltimore City Health Commissioner Dr. Leana Wen reacts to the results of a US-based clinical trial that the AstraZeneca Covid-19 vaccine showed 79% efficacy against symptomatic disease.

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