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 percent of the people KFF polled said they knew of the statements, though whether people believe the claims, which have yet to be established by the medical community, varied.

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Only 4 percent of those surveyed said it is “definitely true” that taking Tylenol during pregnancy increases the risk of the child developing autism, and 35 percent said the claim is “definitely false.” Thirty percent said it is “probably true” and 30 percent said it is “probably false.”

Combined, 65 percent said it’s either probably or definitely false to say that taking acetaminophen during pregnancy increases the chance of a child developing autism, a complex disorder that experts believe is the result of both genetic and environmental factors.

When broken down by political party, 86 percent of Democrats, 67 percent of independents and 43 percent of Republicans said the claims were either probably or definitely false.

The survey shows 59 percent somewhat or strongly disapprove of how Kennedy is handling his new role at the top of the country’s public health infrastructure.

The level of support changes considerably depending on political party affiliation, with 86 percent of Democrats, 64 percent of independents and 26 percent of Republicans disapproving.

A slightly higher number, 62 percent, either somewhat or strongly disapprove of the United States’ vaccine policy.

A similar trend emerged when those polled were broken up by political parties. Eighty-eight percent of Democrats, 67 percent of independents and 31 percent of Republicans somewhat or strongly disapproved of vaccine policy.

The survey shows a declining share of Americans have faith in the Centers for Disease Control and Prevention to provide trusted information about vaccines, compared with previous KFF polls in September 2023 and earlier this year.

A total of 63 percent of respondents two years ago trusted the CDC on vaccines, but that has declined to 50 percent.

Democrats’ faith in the CDC’s vaccine recommendations has dropped from 88 percent two years ago to 64 percent, independents have gone from 61 percent to 47 percent and Republicans have remained relatively steady, only going from 40 percent to 39 percent.

Across political parties, a person’s own doctor as well as the American Academy of Pediatrics and the American Medical Association remain broadly trusted for vaccine information.

Eighty-three percent said they trust their doctor or health care provider, 69 percent believed information from the American Academy of Pediatrics and 64 percent had faith in the AMA.

The poll of 1,334 adults took place from Sept. 23 to Sept. 29 and had a margin of error of plus or minus 3 percentage points for the full survey. Questions broken down by a person’s political ideology had a margin of error of plus or minus 6 percentage points.