WASHINGTON (AP) — Half of all adults in the U.S. have received at least one COVID-19 shot. That's according to the Centers for Disease Control and Prevention.

The announcement on Sunday marks another milestone in the nation’s largest-ever vaccination campaign. It also leaves more work to be done to convince skeptical Americans to roll up their sleeves.

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The CDC says almost 130 million people 18 or older have received at least one dose of a vaccine, or 50.4% of the total adult population. Almost 84 million people adults, or about 32.5% of that population, have been fully vaccinated.

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