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Head of the US Food and Drug Administration, Stephen Hahn raised the possibility in an interview published on Sunday (30/8) that a future vaccine against the coronavirus might be given emergency approval before the end of trials designed to ensure its safety and effectiveness. A request for such extraordinary approval would have to come from the vaccine developer. Three Western drugs makers are well along with their Phase 3 clinical trials, involving tens of thousands of participants. The three are AstraZeneca, which is partnering with Oxford University in England; Moderna, collaborating with the US National Institutes of Health, and the Pfizer/BioNTech alliance. Half of the participants in such trials receive an experimental vaccine, while the other half are given a placebo//CNA