It was one of President Donald Trump’s more audacious picks for his Cabinet: anti-vaccine activist and alternative health advocate Robert F. Kennedy Jr. to helm the nation’s health department.
Kennedy, however, won over the senators needed to confirm him to lead the Department of Health and Human Services, promising not to remove government website statements pointing out that vaccines do not cause autism and to keep current vaccine approval and safety monitoring systems intact. Ahead of being tapped by Trump for the role, he said he wouldn’t take vaccines away from those who wanted them while stressing a desire for individual choice.
Since his confirmation, Kennedy has toed the line between backing vaccination as a preventive public health tool and making statements or overseeing developments that threaten to undermine that tool. His moves have played out against the backdrop of an explosion in vaccine-preventable measles cases in West Texas and an intense flu season that resulted in high rates of hospitalization, along with bird flu outbreaks that have raised the specter of another pandemic.
Here’s a look at notable vaccine-related moves and remarks made by Kennedy or under his authority since he was sworn in as head of HHS on Feb. 13:
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- Dec. 16, 2025 – The CDC ended the long-standing recommendation for all newborns to receive the hepatitis B vaccine at birth after its revamped committee of outside vaccine experts voted 8-3 to scrap it. The agency now recommends parents consult with a healthcare provider to decide whether infants born to hepatitis B-negative mothers should get the vaccine. “We are restoring the balance of informed consent to parents whose newborns face little risk of contracting hepatitis B,” CDC acting Director Jim O’Neill said in a statement.
- Nov. 28, 2025 – Dr. Vinay Prasad, the director of the FDA’s Center for Biologics Evaluation and Research, said in a memo to agency staff that a review “found that at least 10 children have died after and because of receiving COVID-19 vaccination.” In the memo, which was first reported by The New York Times, Prasad said the true number could be higher and accused the agency of ignoring safety concerns. He did not include information like the ages of the kids, whether they had health problems or how the agency staff determined the vaccine-death link. Prasad said he would propose new oversight and review of vaccines.
- Sept. 18-19, 2025 – The CDC’s Advisory Committee on Immunization Practices held a chaotic meeting where it voted to weaken COVID-19 shot recommendations, saying that individuals should consult with their healthcare provider about whether they should get the shot. They decided against a prescription requirement for the shot in a narrow vote. The panel also voted against recommending a combination jab against measles, mumps, rubella and chickenpox, or MMRV, for children under the age of 4 and postponed a vote on the hepatitis B vaccine for newborns.
- July 7, 2025 – Several medical groups sued Kennedy and HHS over his changes to federal vaccine policies, including his decision to remove healthy children and pregnant women from the COVID-19 vaccine schedule, which the plaintiffs asked the court to vacate. The lawsuit accuses Kennedy of working “to dismantle the longstanding, Congressionally-authorized, science- and evidence-based vaccine infrastructure that has prevented the deaths of untold millions of Americans.”
- Aug. 27, 2025 – Kennedy announced that emergency use authorizations for COVID-19 shots were rescinded, instead issuing full marketing authorization for the shots – but only for those who are at “higher risk” of severe COVID-19. The FDA authorization is for adults 65 and older as well as for children and adults with at least one medical condition that puts them at risk of severe illness.
- July 22, 2025 – Kennedy accepted a recommendation from the CDC’s ACIP to remove the mercury-based preservative thimerosal from all influenza vaccines distributed in the U.S. “Injecting any amount of mercury into children when safe, mercury-free alternatives exist defies common sense and public health responsibility,” Kennedy posted on social media. However, many studies have shown that the small amount of thimerosal used in vaccines is harmless. The move is not expected to impact many Americans, as the vast majority of flu vaccines distributed in the U.S. do not contain the preservative.
- May 27, 2025 – Kennedy announced via social media that the CDC was no longer recommending the COVID-19 vaccine for healthy pregnant women and children, citing a “lack of clinical data” to support administering repeat shots for those populations. The move came despite the agency listing pregnancy as a health risk factor for developing complications from COVID-19.
- July 29, 2025 – Democrats on the Senate Health Committee announced that they would investigate Kennedy’s overhaul of the CDC’s ACIP, which makes vaccine recommendations for Americans. “By removing all 17 of ACIP’s members and replacing them with eight individuals handpicked to advance your anti-vaccine agenda, you have put decades of non-partisan, science-backed work – and, as a result, Americans’ lives – at risk,” the Democrats wrote in a letter to Kennedy.
- June 25, 2025 – HHS officials missed a self-set deadline to release ethics forms for new members of the committee before a June meeting. Eventually, Kennedy’s conflict-of-interest database was updated with significantly less information on the new members than prior members.
- June 9, 2025 – Kennedy announced that he was removing all 17 members of the CDC’s ACIP, which makes vaccine recommendations for Americans. “A clean sweep is necessary to reestablish public confidence in vaccine science,” Kennedy said in a statement. The removal went against a promise Kennedy made to GOP Sen. Bill Cassidy of Louisiana to gain the senator’s vote for Kennedy’s confirmation.
- Nov. 19, 2025 – The CDC revised its long-held stance that vaccines don’t cause autism, now saying on its website that the consensus is “not an evidence-based claim.” It continues: “Studies supporting a link have been ignored by health authorities.” The change sparked outcry from public health groups as well as Cassidy, who voted for Kennedy’s confirmation after gaining several commitments from him, including one to not remove language on the CDC website pointing out that vaccines do not cause autism. “What parents need to hear right now is vaccines for measles, polio, hepatitis B and other childhood diseases are safe and effective and will not cause autism,” Cassidy posted on social media after the website was updated.
- Sept. 22, 2025 – Kennedy joined Trump at a White House event where the president claimed that vaccines should “be taken separately” rather than as a combined shot and that “it seems when you mix them, there could be a problem.” Trump also promoted claims about vaccines and autism, saying, “I think I can say that there are certain groups of people that don’t take vaccines and don’t take any pills that have no autism.” Kennedy added that the Trump administration will be “closely examining” vaccines as it seeks to find the cause of autism, which the HHS secretary had previously promised would come by September.
- March 25, 2025 – The Washington Post reported that HHS had hired David Geier to study potential connections between vaccines and autism – a debunked theory he has previously promoted that again drew the spotlight after Kennedy refused to reject the claim during his confirmation hearings. Geier faced disciplinary action from state regulators more than a decade ago for practicing medicine without a license and was listed as a data analyst in the HHS employee directory, according to the Post.
- Jan. 5, 2026 – The CDC announced a revamped childhood vaccine schedule that decreased the number of vaccines recommended for children, nixing shots for flu, rotavirus, hepatitis A, hepatitis B, some forms of meningitis and RSV. Vaccines for those diseases are only recommended now for certain groups deemed high risk. The Trump administration said that all shots would continue to be covered by insurance companies. “This decision protects children, respects families and rebuilds trust in public health,” Kennedy said in a statement. The American Academy of Pediatrics and other public health organizations sued over the move, calling it “harmful and unlawful.”
- Sept. 9, 2025 – A new MAHA strategy report said that HHS and the White House Domestic Policy Council will develop a framework focused on “ensuring America has the best childhood vaccine schedule.”
- Feb. 18, 2025 – In his first address to agency staff after taking over as HHS secretary, Kennedy said a commission would investigate the childhood vaccination schedule, questioning whether it was among “possible factors” tied to poor health in the U.S. Kennedy said the Make America Healthy Again commission – created by a Trump order – would convene “representatives of all viewpoints” to examine potential causes behind a “drastic rise in chronic disease,” including some issues that “were formerly taboo and insufficiently scrutinized.”
- Aug. 27, 2025 – The White House fired CDC Director Susan Monarez less than a month into her new role after she clashed with Kennedy over vaccine policies. Kennedy reportedly asked Monarez to fire career agency officials and commit to backing his own advisers, which she refused to do. Four high-ranking officials resigned in support of the former director.
- July 2025 – Prasad, the FDA’s top vaccine official and Trump’s replacement for Dr. Peter Marks, left the post after less than three months on the job. Prasad “did not want to be a distraction,” an HHS spokesperson said in a statement, adding that he was leaving the role to “spend more time with his family.” But less than two weeks after his ouster, Prasad was rehired to the same role. “At the FDA’s request, Dr. Vinay Prasad is resuming leadership of the Center for Biologics Evaluation and Research,” HHS spokesperson Andrew Nixon said.
- March 28, 2025 – The Wall Street Journal reported that Marks – the FDA’s former top vaccine official and head of the Center for Biologics Evaluation and Research – submitted his resignation after being forced to either resign or be fired. In a resignation letter, Marks said he’d been “willing to work to address (Kennedy’s) concerns regarding vaccine safety and transparency,” but accused the HHS chief of merely wishing for “subservient confirmation of his misinformation and lies.”
- May 14, 2025 – Kennedy, in his testimony to lawmakers on Trump’s budget proposal that would slash the HHS budget by more than a quarter, said that his “opinions about vaccines are irrelevant.” He added that he doesn’t think “people should be taking medical advice from me.” When Kennedy was questioned about whether he would hypothetically vaccinate a child of his for measles, he said, “probably, for measles.” He wouldn’t answer the same question about vaccines for chicken pox or polio.
- April 2025 – Kennedy told CBS News after the second measles death in an unvaccinated child in the U.S. that people should get the measles vaccine but that the “government should not be mandating those.” Despite his endorsement of the vaccine, Kennedy said in the same interview that “we’re always going to have measles, no matter what happens, as the vaccine wanes very quickly.” However, according to the CDC, most people who are vaccinated against measles “will be protected for life.”
- March 11, 2025 – In an interview with Fox News’ Sean Hannity, Kennedy said the measles vaccine “does cause deaths every year … so people ought to be able to make that choice for themselves.” According to the Infectious Diseases Society of America, no deaths have been found to be related to the measles, mumps and rubella vaccine among healthy people, while “there have been rare cases of deaths from vaccine side effects among children who are immune compromised.” The CDC recommends such individuals not get the MMR vaccine or wait to get it.
- March 4, 2025 – In an interview with Fox News, Kennedy stressed nutrition and exercise as ways to avoid being severely impacted by measles: “It’s very, very difficult for measles to kill a healthy person.” He said the area in West Texas undergoing a measles outbreak is “kind of a food desert” and that malnutrition “may have been an issue” for a child who died of measles in that outbreak. State health officials said the child, who was not vaccinated, “had no known underlying conditions.”
- March 2, 2025 – Kennedy wrote in a Fox News op-ed that “studies have found that vitamin A can dramatically reduce measles mortality.” He pointed to a CDC recommendation, updated after he took office, supporting the use of vitamin A to treat measles infections. While health experts acknowledge that vitamin A can be beneficial for patients with a measles infection, they’ve also emphasized it is not a replacement for vaccination and warned that it can cause dangerous health complications when given in excess.
- December 2025 – HHS terminated millions in grant money for the American Academy of Pediatrics because the initiatives “no longer align with the Department’s mission or priorities,” according to an HHS spokesman. The group has criticized the changes Kennedy has made to federal vaccine policies. “The sudden withdrawal of these funds will directly impact and potentially harm infants, children, youth and their families in communities across the United States,” said Mark Del Monte, the academy’s chief executive and executive vice president.
- Aug. 5, 2025 – HHS announced it will pull contracts and cut funding for 22 vaccine development projects totaling nearly $500 million. “After reviewing the science and consulting top experts at NIH and FDA, HHS has determined that mRNA technology poses more risks than benefits for these respiratory viruses,” Kennedy said in a video announcement on social media, referring to the vaccine technology used in COVID-19 and flu shots. But infectious disease experts argued the decision puts the U.S. at risk for future pandemics, crediting mRNA technology for the fast turnaround of the COVID-19 vaccines.
- March 2025 – The Trump administration targeted NIH grants aimed at studying vaccine hesitancy and how to improve immunization levels. According to NPR, more than 40 grants related to vaccine hesitancy were canceled.
- January 2026 – Kennedy removed at least four members of the Advisory Commission on Childhood Vaccinations, which reviews issues relating to the Vaccine Injury Compensation Program. The committee suggests which vaccines and what conditions should be covered by the program, which Kennedy plans to revamp.
- Sept. 9, 2025 – In its MAHA strategy report, the Trump administration said that HHS and NIH will “investigate vaccine injuries with improved data collection and analysis, including through a new vaccine injury research program at the NIH Clinical Center that may expand to centers around the country.”
- July 28, 2025 – Kennedy posted on social media his plan to revamp the federal system to compensate people harmed by vaccines. Kennedy said that the Vaccine Injury Compensation Program “is broken, and I intend to fix it.” According to Kennedy, the program has paid out $5.4 billion to 12,000 petitioners since its inception in 1986. He accused the program of dismissing cases that have merit and slow-walking others. “I will not allow the VICP to continue to ignore its mandate and fail its mission of quickly and fairly compensating vaccine-injured individuals,” Kennedy said. The program “is a no-fault alternative to the traditional legal system for resolving vaccine injury petitions,” according to the Health Resources and Services Administration.
- Aug. 14, 2025 – HHS announced it is reinstating the Task Force on Safer Childhood Vaccines – a panel created by Congress to improve safety and oversight – in a move requested by Children’s Health Defense, the anti-vaccine advocacy group Kennedy previously led. The task force, which was disbanded in 1988, will now work with the Advisory Commission on Childhood Vaccines to produce regular recommendations. The move comes after Children’s Health Defense sued Kennedy in July for failing to establish the task force.
– Former U.S. News writer Steven Ross Johnson contributed to this report
Cecelia Smith-Schoenwalder
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