Peter Marks (Jim Lo Scalzo/Pool via AP Images)

FDA's Pe­ter Marks to Con­gress: Youngest kids vac­cine won't need to hit 50% ef­fi­ca­cy mark

The FDA’s top vac­cine leader told a con­gres­sion­al com­mit­tee on Fri­day af­ter­noon that al­though the adult vac­cines had to meet a 50% thresh­old for ef­fi­ca­cy …

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