Want a COVID-19 vaccination this fall? For many Americans, it’s not clear how easy it will be to get one — and some doctors already see signs of trouble.

Health Secretary Robert F. Kennedy Jr., who was a longtime anti-vaccine activist, said last month that the shots are no longer recommended for healthy children and pregnant women, usurping a decision normally made by scientific experts, not political appointees .

Days later, the Centers for Disease Control and Prevention said healthy children and pregnant women “may” get COVID-19 vaccinations, removing stronger language that those groups “should” get the shots. Its website later was changed to list no advice for pregnant women — graying out that section of the vaccine guidance chart.

The change follows an earlier Trump admini

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