Pfizer coronavirus vaccine could be given to Americans before end of the year, CEO says

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Pfizer CEO Albert Bourla said the drugmaker should have key data from its late-stage trial for the Food and Drug Administration by the end of October.

If the FDA approves the vaccine, the company is prepared to distribute "hundreds of thousands of doses," he said. 

On Saturday, Pfizer submitted a proposal to the FDA to expand the late-stage trial to include up to 44,000 participants, a significant increase from its previous target of 30,000.