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Continue to ChatThat is the default and certainly the FDA (U.S. Food and Drug Administration) has that particular pathway available. If it is not possible to get the rigorous human data, it is still possible a vaccine could be approved. - Francis Collins from https://whatsmyquote.com/quote/that-is-the-default-and-certainly-the-fda-u-s-food-and-drug-administration-has-that-particular-pathway