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The head of the U.S. Food and Drug Administration says that coronavirus vaccines may be given emergency approval before rigorous clinical trials are complete, according to recent news reports.

Only a couple of coronavirus vaccine candidates in the U.S. have advanced to phase 3 clinical trials, which are the most critical tests needed to prove, in tens of thousands of people, that a vaccine is both safe and effective at preventing COVID-19. Typically, a vaccine must pass these advanced trials before given approval — but the pandemic has pushed vaccine development to unprecedented timescales.

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