AstraZeneca says U.S. trial data shows its COVID-19 vaccine 79% effective 

AstraZeneca says advanced trial data from a U.S. study on its COVID vaccine shows it is 79% effective.

This story was originally published on  CBC News. To read the rest of this news worthy story, please visit https://www.cbc.ca/news/world/astrazeneca-oxford-trial-efficacy-1.5958717?cmp=rss.

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