The delay is the latest to beset the most traditional class of vaccines backed by Operation Warp Speed, the Trump administration’s effort to speed up vaccine development. The vaccines that have racked up early successes, such as those from Moderna and Pfizer-BioNTech, which an advisory committee recommended Thursday should be authorized, were seen as major risks, because the technologies are new.
Source Article from https://www.washingtonpost.com/nation/2020/12/11/coronavirus-covid-live-updates-us/
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