A sweeping analysis of health data from more than 1.2 million children in Denmark born over a 24-year period found no link between the small amounts of aluminum in vaccines and a wide range of health conditions—including asthma, allergies, eczema, autism, and attention deficit-hyperactivity disorder (ADHD).

The finding, published in the Annals of Internal Medicine, firmly squashes a persistent anti-vaccine talking point that can give vaccine-hesitant parents pause.

Small amounts of aluminum salts have been added to vaccines for decades as adjuvants, that is, components of the vaccine that help drum up protective immune responses against a target germ. Aluminum adjuvants can be found in a variety of vaccines, including those against diphtheria, tetanus, and pertussis, Haemophilus influenzae type b (Hib), and hepatitis A and B.

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Health and medical groups around the country are bracing for another grievous blow to America's infrastructure of evidence-based health, this time targeting preventive medicine.

Earlier this week, health secretary and ardent anti-vaccine activist Robert F. Kennedy Jr. abruptly canceled a meeting of the United States Preventive Services Task Force (USPSTF), a scientifically independent panel of up to 16 volunteer experts that issues rigorous, evidence-based recommendations on preventive care—on everything from colonoscopies to folic acid supplements in pregnancy. The panel uses a highly transparent and rigorous framework, grading recommendations on an A to D scale. Recommendations with an A or B grade are adopted nationwide, and health insurance plans are required to cover them at no cost to patients.

The meeting scheduled for Thursday was reportedly going to focus on cardiovascular disease. Kennedy canceled it without explanation.

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The vaccine panel hand-selected by health secretary and anti-vaccine advocate Robert F. Kennedy Jr. on Thursday voted overwhelmingly to drop federal recommendations for seasonal flu shots that contain the ethyl-mercury containing preservative thimerosal. The panel did so after hearing a misleading and cherry-picked presentation from an anti-vaccine activist.

There is extensive data from the last quarter century proving that the antiseptic preservative is safe, with no harms identified beyond slight soreness at the injection site, but none of that data was presented during today's meeting.

The significance of the vote is unclear for now. The vast majority of seasonal influenza vaccines currently used in the US—about 96 percent of flu shots in 2024–2025—do not contain thimerosal. The preservative is only included in multi-dose vials of seasonal flu vaccines, where it prevents the growth of bacteria and fungi potentially introduced as doses are withdrawn.

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After anti-vaccine advocate and US health secretary Robert F. Kennedy Jr. fired all 17 experts who sat on a revered federal vaccine panel and restocked it with eight dubious members, a growing chorus of lawmakers, health experts, and public advocates are calling for a pivotal meeting scheduled for Wednesday to be scrapped and for the panel to be "dissolved" and remade with qualified members.

On June 9, Kennedy unilaterally cleaned out the Centers for Disease Control and Prevention's Advisory Committee for Immunization Practices (ACIP). Though vetting for the committee has historically taken up to two years, Kenney announced the eight new members two days later. Some of the members are clear anti-vaccine activists, others have espoused contrarian or anti-public health perspectives, and some also have little to no relevant expertise for being on ACIP.

"[T]he reconstituted ACIP is a farce," Robert Steinbrook, a director at consumer rights watchdog Public Citizen, said in a statement. "Rather than further sullying the ACIP and undermining public confidence in vaccines, this week’s meeting should be rescheduled after the Senate has confirmed a new CDC Director who can both appoint an authoritative and representative committee and be able to approve the panel’s recommendations."

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With ardent anti-vaccine activist Robert F. Kennedy Jr. in the country's top health position, use of a long-approved vaccine against measles, mumps, rubella, and varicella/chickenpox (MMRV) as well as flu shots that include the preservative thimerosal will now be reevaluated, putting their future availability and use in question. The development seemingly continues to vindicate health experts' worst fears that, as health secretary, Kennedy would attack and dismantle the federal government's scientifically rigorous, evidence-based vaccine recommendations.

Discussions of the two types of vaccines now appear on the agenda of a meeting for the Centers for Disease Control and Prevention's Advisory Committee for Immunization Practices (ACIP) scheduled for two days next week (June 25 and 26).

ACIP’s overhaul

On June 9, Kennedy summarily fired all 17 members of ACIP, who were rigorously vetted—esteemed scientists and clinicians in the fields of immunology, epidemiology, pediatrics, obstetrics, internal and family medicine, geriatrics, infectious diseases, and public health. Two days later, Kennedy installed eight new members, many with dubious qualifications and several known to hold anti-vaccine views.

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All 17 experts ousted from the federal vaccine advisory committee have spoken out about the drastic changes that anti-vaccine advocate and current US health secretary Robert F. Kennedy Jr. has made since taking office. Those changes include unilaterally restricting access to COVID-19 vaccines and summarily firing the entire Advisory Committee on Immunization Practices (ACIP), which had guided federal vaccine policies for more than 60 years.

"We are deeply concerned that these destabilizing decisions, made without clear rationale, may roll back the achievements of US immunization policy, impact people’s access to lifesaving vaccines, and ultimately put US families at risk of dangerous and preventable illnesses," the fired experts write in an editorial published in JAMA.

Kennedy dismissed the entire committee on June 9, accusing the former members of lacking public trust and being "plagued with persistent conflicts of interest," despite the committee's transparent disclosure and conflict of interest policies.

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In now-rarified comments from experts at the Centers for Disease Control and Prevention, an agency official on Tuesday evening said the explosive measles outbreak mushrooming out of West Texas will require "significant financial resources" to control and that the agency is already struggling to keep up.

"We are scrapping to find the resources and personnel needed to provide support to Texas and other jurisdictions," said David Sugerman, the CDC's lead on its measles team. The agency has been devastated by brutal cuts to CDC staff and funding, including a clawback of more than $11 billion in public health funds that largely went to state health departments.

Sugerman noted that the response to measles outbreaks is generally expensive. "The estimates are that each measles case can be $30,000 to $50,000 for public health response work—and that adds up quite quickly." The costs go to various responses, including on-the-ground response teams, vaccine doses and vaccination clinics, case reporting, contact tracing, mitigation plans, infection prevention, data systems, and other technical assistance to state health departments.

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