AstraZeneca said its COVID-19 vaccine had a 76 per cent efficacy rate at preventing symptomatic illness in a new analysis of its major U.S. trial — slightly lower than the level announced earlier this week in a report that was criticized for using outdated information.
source https://www.cbc.ca/news/world/astrazeneca-trial-efficacy-1.5963123?cmp=rss
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