Live Breaking News & Updates on Ellow adviser dr patrick moore of the university pittsburgh said last week as government experts debated whether its time for moderna boosters he wondered if sucha switch would be particularly useful to block mild infection simple answer fda month okd extra doses pfizers original recipe after studies showed it still works well enough against delta and those could rolled out right away now is weighing evidence johnson amp vaccines less churn burn on manufacturing only formulas when really necessary

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Why COVID boosters weren't tweaked to better match variants

Studies show an extra dose of the original formulas revs up virus-fighting antibodies that fend off infection, including antibodies that target delta.

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