WASHINGTON — U.S. regulators approved updated COVID-19 shots Wednesday but limited their use for many Americans — and removed one of the two vaccines available for young children.

The new shots from Pfizer, Moderna and Novavax are approved for all seniors. But the Food and Drug Administration narrowed their 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.

Additionally, Pfizer's vaccine will no longer be available for children under age 5, after the FDA said it revoked the shot's emergency authorization for that age group.

Parents will still be a

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