The head of the National Institutes of Health just admitted on camera what his boss, Health Secretary Robert F. Kennedy Jr., refuses to accept: vaccines don’t cause autism.

NIH Director Jay Bhattacharya appeared before the Senate Committee on Health, Education, Labor, and Pensions on Tuesday, where Senator Bernie Sanders cornered him with a simple question that Kennedy has spent years dodging.

THE DETAILS: Sanders wasn’t about to let Bhattacharya weasel out of this one. When the NIH chief initially tried to narrow his answer to just the measles vaccine, Sanders pushed back hard: “Nah. Uh uh. I didn’t ask measles. Do vaccines cause autism?”

“I have not seen a study that suggests any single vaccine causes autism,” Bhattacharya finally admitted.

BERNIE SANDERS: Do vaccines cause autism?

BHATTACHARYA: I do not believe that the measles vaccine causes autism

SANDERS: Nah. Uh uh. I didn't ask measles. Do vaccines cause autism?

BHATTACHARYA: I have not seen a study that suggests any single vaccine causes autism pic.twitter.com/XiohmFtymT

— Aaron Rupar (@atrupar) February 3, 2026

This exchange exposed a glaring contradiction at the heart of the Trump administration’s public health apparatus. You’ve got the guy running the nation’s premier medical research institution directly contradicting the guy running the entire Department of Health and Human Services on a foundational question of vaccine safety.

WHY IT MATTERS: This isn’t just bureaucratic disagreement—it’s the health secretary’s anti-vax crusade running headfirst into actual science. Kennedy has made attacking vaccines the cornerstone of his public health policy. Since taking over HHS, he’s replaced independent medical experts on the CDC’s vaccine advisory panel with vaccine skeptics, warned against the MMR vaccine during Texas’s historic measles outbreak (recommending vitamin A instead), and overhauled the entire child vaccination schedule without even telling his own staff.

The anti-vaccine myth Kennedy champions traces back to a fraudulent paper by a researcher who lost his medical license and eventually rescinded his claims. Since then, dozens of studies—including one tracking more than 660,000 children over 11 years—have proven there’s no link between vaccines and autism.

OF COURSE

Sanders made the broader point explicit, asking whether having the American Medical Association say vaccines don’t cause autism while the HHS secretary says the opposite might create “concern and mistrust among parents.”

Bhattacharya tried to deflect by citing a 2024 study showing only 40 percent of patients trust their doctors—conveniently noting it was published before Kennedy’s appointment. But that statistic only underscores how dangerous it is to have the nation’s top health official actively undermining vaccine confidence.

BOTTOM LINE

Vaccines are one of modern medicine’s greatest achievements, so effective they’ve eradicated diseases like smallpox and nearly wiped out polio. That success has paradoxically led some people to forget how deadly these diseases actually were. Now we have a health secretary whose entire public health philosophy is built on debunked conspiracy theories—and his own agency chief just went on the record contradicting him.