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| - As U.S. Health Secretary and longtime anti-vaccine activist Robert F. Kennedy, Jr., announced he would reform the Vaccine Injury Compensation Program (VICP) to weaken or remove liability protections for vaccines in July 2025, a rumor began to spread that a Danish study found childhood vaccines do not cause chronic illnesses.
For example, the Facebook page of Occupy Democrats posted about the study, saying it had found "zero extra cases of autism, asthma, or 48 other conditions" (
The post had gained 47,000 likes and 13,000 reshares as of this writing. The claim further spread on
As infectious disease scientists expressed concern that Kennedy's effort to overhaul the VICP could lead vaccine makers to stop producing vaccines for fear of liability exposure, the Statens Serum Institute in (SSI) Denmark published a study that showed the aluminum in childhood vaccines did not cause chronic illness. (The Institute's "main duty is to ensure preparedness against infectious diseases and biological threats as well as control of congenital disorders," according to its About page.) The findings run contrary to the claim peddled for years by the Children's Health Defense (CHD), an anti-vaccine organization Kennedy chaired for years.
The resulting article of the SSI study, published on July 15, 2025, in the Annals of Internal Medicine, said that the researchers had followed more than 1.2 million children born from 1997 to 2018 until 2020, when the last group of children turned 2 years old.
The study aimed to verify if the cumulative dose of aluminum children received in immunizations from birth to 2 years old caused chronic illnesses, such as asthma, allergies, autoimmune diseases or even neuro-developmental disorders such as autism or attention deficit and hyperactivity disorder. Vaccine makers add trace aluminum to vaccines as an adjuvant — a component that boosts the body's immune response to the shot.
After analyzing the data, the team of researchers found there was no link between aluminum in early childhood vaccines and chronic conditions. "Cumulative aluminum exposure from vaccination during the first 2 years of life was not associated with increased rates of any of the 50 disorders assessed," the researchers wrote in the article.
Adding to their statistical analysis of the data, the scientists cited a 2011 study that showed exposure to aluminum in vaccines was "well below established minimal risk level thresholds." In addition, they said that "a small study of 15 preterm infants reported no measurable change in serum aluminum concentrations after vaccination with aluminum-
This was only the most recent study that confirmed the safety of vaccines. In 2016, Snopes debunked the claim that autism resulted from vaccines. As U.S. President Donald Trump prepared to take office in January 2025, Snopes explored the various reasons for an increase in autism diagnoses, which did not include vaccines.
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