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Moderna said its current FDA-authorized 50-microgram booster shot increased antibody levels against omicron 37-fold compared to pre-booster levels.
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The Moderna vaccine's ability to shield against infection drops sharply when tested on the omicron variant. But getting a booster pumps the protection back up again, new research suggests.
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The FDA on Friday granted emergency use authorization for the Pfizer-BioNTech and Moderna booster shots. The boosters have already been available for people 65 and older and to high-risk adults.
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Moderna says the FDA is looking into reports of a rare side effect — myocarditis, or the inflammation of the heart muscle — in those who've gotten the shot.
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Moderna says a study in kids 6 to 11 found two doses of the company's COVID-19 vaccine given 28 days apart produced a strong antibody response.
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CDC Director Rochelle Walensky also endorsed a mix-and-match approach to boosters that would be flexible for patients and health care providers.
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The Food and Drug Administration also gave an OK to boosters that differ from the vaccine originally used to immunize people against COVID-19. A mix-and-match approach could ease the booster rollout.
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The recommendation applies to people 65 years and older, those 18 to 64 who are at high risk of severe COVID and those whose work or institutional exposure puts them at high COVID risk.
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Should people who get a COVID booster get a different vaccine from their original shot? The results of a highly anticipated study suggest that in some cases the answer may be yes.
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The Food and Drug Administration released briefing documents Tuesday on booster shots for the Moderna and Johnson & Johnson COVID vaccines ahead of a two-day advisory meeting that starts Thursday.