A new poll from KFF shows many Americans disapprove of the performance of Secretary of Health and Human Services Robert R. Kennedy. (John Partipilo/Tennessee Lookout)

WASHINGTON — A majority of Americans disapprove of Health and Human Services Secretary Robert F. Kennedy Jr.’s job performance and the federal government’s evolving vaccine policy, according to a poll released Thursday by the nonpartisan health organization KFF.

In addition, the vast majority of those surveyed have heard the unproven claims made by President Donald Trump, Kennedy and others in late September that taking acetaminophen, also known as Tylenol, during pregnancy could be one possible environmental factor in a child later being diagnosed with autism.

A total of 77% of the people KFF polled said they knew of the

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