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Kennedy has long advanced the . He has also pushed other conspiracy theories, such as that to spare Ashkenazi Jews and Chinese people, comments he later said were taken out of context. He has repeatedly when discussing vaccines and .

No medical intervention is risk-free. But doctors and researchers have proven that risks from disease are generally far greater than the risks from vaccines.

Vaccines have been proven to be safe and effective in laboratory testing and in real world use in hundreds of millions of people over decades — they are considered among the most effective public health measures in history.

Kennedy has insisted that he is , saying he only wants vaccines to be rigorously tested, but he also has shown opposition to a wide range of immunizations. Kennedy said in a 2023 podcast interview that “There’s no vaccine that is safe and effective� and told Fox News that he still believes in the that vaccines can cause autism. In a 2021 podcast he urged people to “resist� CDC guidelines on when kids should get vaccines.

“I see somebody on a hiking trail carrying a little baby and I say to him, better not get them vaccinated,� Kennedy said.

That same year, in a video promoting an anti-vaccine sticker campaign by his nonprofit, Kennedy appeared onscreen next to one sticker that declared “IF YOU’RE NOT AN ANTI-VAXXER YOU AREN’T PAYING ATTENTION.�

The World Health Organization has estimated that global immunization efforts have saved in the past 50 years.

In a , researchers found Kennedy’s personal Twitter account was the top “superspreader� of vaccine misinformation on Twitter, responsible for 13% of all reshares of misinformation, more than three times the second most-retweeted account.

He has traveled to states including , and to lobby or sue over vaccine policies and has traveled the world to meet with anti-vaccine activists.

Kennedy has also aligned himself with and special interests groups , who saw profit in slicing off a small portion of the larger health care market while spreading false or dubious health information.

An Associated Press investigation found one chiropractic group in California had to Kennedy’s Children’s Health Defense, about one-sixth of the group’s fundraising that year. Another AP investigation found he was , where he was ranked among the Top 10 for the series’ “Overall Sales Leaderboard.�

His group has co-published a number of anti-vaccine books that have been debunked. One, called “Cause Unknown,� is built on that sudden deaths of young, healthy people are spiking due to mass administration of COVID-19 vaccines. Experts say these and have not become more prevalent.

An AP found dozens of individuals included in it died of known causes not related to vaccines, including suicide, choking while intoxicated, overdose and allergic reaction. One person died in 2019.

Children’s Health Defense currently has a lawsuit pending against a number of news organizations, among them The Associated Press, accusing them of violating antitrust laws by taking action to identify misinformation, including about COVID-19 and COVID-19 vaccines. Kennedy took leave from the group when he announced his run for president but is listed as one of its attorneys in the lawsuit.