At 6:45 Monday morning in Savannah, Georgia, a volunteer was injected in a Phase III study of mRNA-1273, an experimental vaccine made by Moderna. Thus began the first final-stage study of a COVID-19 vaccine in the US. At 5:15 that afternoon, two other companies, Pfizer and BioNTech, announced that they had begun a late-stage study of their jointly developed COVID-19 vaccine, BNT162b2. The world could learn as early as October or November whether the vaccines are broadly safe and effective.
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