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Biotechnology company Moderna announced Monday that preliminary data suggests its half-dose booster shot increased antibody levels against Omicron compared with the levels seen when a fully vaccinated person does not receive a booster -- and a larger-sized dose of the booster increases antibody levels even more.

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A federal advisory panel endorsed a plan to give Pfizer booster shots against COVID-19 to those who are 65 or older or run a risk of severe disease after rejecting a plan to give extra shots to most Americans.

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