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The step — first reported by The Washington Post, which cited dozens of expected cancellations — is highly unusual, as entire swaths of research typically aren’t ended mid-stream.

“It is the policy of NIH not to prioritize research activities that focuses gaining scientific knowledge on why individuals are and/or explore ways and commitment,� say NIH letters sent to two researchers with different grants.

“It’s really concerning,� said Dr. Sean O’Leary of the American Academy of Pediatrics, who viewed and read aloud from two letters other scientists had received, noting the claim that the research doesn't benefit people or improve quality of life.

"That's inaccurate. Vaccines clearly save lives, there’s no question about the science of that,� O’Leary said. Better understanding what parents want to learn from their pediatrician – or adults’ questions about their own shots -- is “really about improving care and not just necessarily about just the vaccination rates.�

“You can’t say you’re for vaccine safety and not study how people think about vaccines,� added Dr. Georges Benjamin of the American Public Health Association.

Some of the canceled grants are a type that help fund the salaries of promising young researchers, whose careers may be threatened, O’Leary said.

It’s the latest move against vaccines since Robert F. Kennedy Jr. became the nation’s health secretary, directing the agency that oversees the NIH, Centers for Disease Control and Prevention and Food and Drug Administration. Kennedy has long criticized vaccines and since taking the new post has vowed to investigate the childhood vaccine schedule — shots that prevent measles, polio and other dangerous diseases — and CDC and FDA meetings of independent vaccine advisers .

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