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A record 4 million people in U.S. received a vaccine on Saturday

A healthcare worker wearing a "Team Vaccine" hat administers a dose of the Pfizer-BioNTech vaccine at a clinic in McClellan, Calif., last week. (David Paul Morris/Bloomberg)
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More than four million people in the United States received a coronavirus vaccine on Saturday — the nation’s highest one-day total since the shots began rolling out in December — amid a rising caseload and increase in hospitalizations.

An average of 3.1 million shots were administered each day over the past seven days, and nearly 1 in 4 adults are now fully vaccinated, said Andy Slavitt, the White House’s senior adviser for covid-19 response, speaking at a news briefing.