Boosters provide the best protection against Omicron variant, CDC studies show, raising new questions about what it means to be fully vaccinated

(CNN)Three large new studies from the US Centers for Disease Control and Prevention highlight the importance of getting a booster shot to provide the best protection against the Omicron coronavirus variant.

This is the first real-life data to examine the effect of boosters against Omicron, which now accounts for more than 99% of coronavirus cases in the United States. The studies, released Friday, raise the question of whether people with just two vaccine doses should still be considered fully vaccinated.

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