Biologist Jason Plyler holds a plate containing immune cells ready for genetic analysis at the Vaccine Research Center at the National Institutes of Health, Tuesday, Dec. 19, 2017, in Bethesda, Md. Researchers hope they're finally closing in on stronger flu shots, ways to boost much-needed protection against ordinary winter influenza and guard against future pandemics at the same time.  (AP Photo/Carolyn Kaster)

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