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Major changes are coming for those who want the new COVID-19 shot this fall. Up until now, anyone 6 months and older who wanted the new COVID shot, which is updated each fall to better match the circulating COVID variants, was eligible to get it.

Now, it’s been announced that the U.S. Food and Drug Administration is changing the recommendations for the fall COVID-19 shot. Those now eligible for the shot include people over the age of 65 and people 6 months and up who have underlying medical conditions — but younger, healthy people won’t be eligible for the jab.

“I’m concerned about this new decision by the FDA to limit the COVID-19 vaccine to people 65 and older and people over 6 months with at least one known underlying medical condition. It’s a dramatic shift from the current CDC guidance, which recommends the vaccine for anyone 6 months and older,” Dr. Oni Blackstock, a primary care and HIV physician who is the founder and executive director of Health Justice, a racial and health equity consulting company, told HuffPost.

“I think [the new COVID shot guidelines] lack an evidence base and a clear rationale for changing them,” Tara Smith, a professor of epidemiology, told HuffPost.