The Food and Drug Administration approved updated COVID-19 vaccines Wednesday, but limited their use to seniors and those with high-risk health conditions.

The new restrictions — previewed by FDA officials in May — are a break from the previous U.S. policy, which recommended an annual COVID-19 shot for all Americans 6 months and up. They reflect heightened skepticism about the ongoing risks of COVID-19 and the need for yearly booster shots from Health Secretary Robert F. Kennedy Jr. and FDA Commissioner Marty Makary, who were both outspoken critics of wide-scale vaccinations.

The revamped vaccines target a newer version of the continuously evolving virus and are set to begin shipping immediately. But it could be days or weeks before many Americans know if they’ll be able to get one, with

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