WASHINGTON —

U.S. regulators approved Pfizer’s updated COVID-19 shot Wednesday but with limits that could complicate access for millions of American adults and children.

Pfizer said in a release its vaccine is now approved for all seniors to protect against the virus this fall. But the Food and Drug Administration narrowed its use for younger adults and children to those with at least one high-risk health condition, such as asthma or obesity. That presents new barriers to access for millions of Americans who’d have to prove their risk -- and millions more who may want to get vaccinated and suddenly no longer qualify.

U.S. health officials did not immediately confirm the news but they generally approve updated shots from the nation’s two leading COVID-19 vaccine makers at the same time.

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