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Updated boosters made by both Pfizer and rival Moderna rolled out earlier this month for everyone 12 and older.
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Moderna and Pfizer’s two-shot vaccines both use mRNA technology to help patients fight the coronavirus.
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Pfizer shots for 5- to 11-year-olds opened in November, but only about 30% of that age group have gotten the initial two doses.
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The data is preliminary and hasn't undergone scientific review.
Associated Press reports the US greenlighted its first COVID-19 vaccine.
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Pfizer says an early peek at its vaccine data suggests the shots may be 90% effective at preventing COVID-19. Monday's announcement doesn't mean a vaccine is imminent.