U.S. COVID booster uptake has slowed, only 11.5 million have received updated shots

11.5M Americans have received updated COVID booster: CDC CDC data shows that only 11.5 million Americans have received the updated COVID-19 booster. ABC News ABC News

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Experts told ABC News that while it's great many Americans have gotten the new booster, they are worried uptake is not as high as it should be ahead of the colder weather months, when COVID-19 typically spreads much more quickly.

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