DR. ELIZABETH MUMPER ON AUTISM, VACCINES, AND HONEST SCIENCE
The HighWire with Del Bigtree | October 9, 2025
Pediatrician and researcher Dr. Elizabeth Mumper joins Del to discuss experiences throughout her career, including the vast increase in autism observed since she was in medical school, the clear health differences she’s seen between vaccinated and unvaccinated children, and how scientific inquiry has been captured. She explains why the upcoming film ‘An Inconvenient Study’ could mark a turning point for both doctors and parents questioning vaccine safety.
Calls for journal to retract Danish study after corrected data show link between aluminum in vaccines and autism
By Suzanne Burdick, Ph.D. | The Defender | July 24, 2025
The authors of a recent Danish study widely reported on by mainstream media claimed they found no link between the aluminum in vaccines and autism.
However, corrected data added after the study’s original July 15 publication date show the authors got it wrong — in fact, the data in the study of 1.2 million children clearly indicate a link between aluminum in vaccines and autism, according to scientists with Children’s Health Defense (CHD) who reviewed the study and the corrected data.
On July 17, the Annals of Internal Medicine, which published the Danish study, added a disclaimer stating that it “included an incorrect version of the Supplementary Material at the time of initial publication.”
The updated materials are available with the link to the study at “Correction: Aluminum-Adsorbed Vaccines and Chronic Diseases in Childhood.”
CHD Senior Research Scientist Karl Jablonowski broke the news of the buried autism link on Monday’s episode of “Good Morning, CHD.” Today, Jablonowski told The Defender :
“According to the corrected data, nearly 10 (9.7) of every 10,000 children who were vaccinated with a higher dose of aluminum (compared to a moderate dose) developed a neurodevelopmental disorder — mostly autism — between ages 2 and 5.”
On Monday, The Defender reached out to lead author Anders Hviid, a professor and department head of epidemiology at the Statens Serum Institut, for comment on the allegation that the corrected data show a link between increased aluminum exposure and autism. In response, we received an automated email from Hviid stating that he was “out-of-office for the summer,” until Aug. 11.
The study’s corresponding author, Niklas Worm Andersson, M.D, Ph.D., an epidemiology researcher at the Statens Serum Institut, did not respond to a request for comment.
On July 14 — a day before the study was published and three days before the journal issued a correction — Hviid told numerous media outlets that the study showed aluminum in vaccines does not cause autism.
As of press time today, the authors of the study had not revised their findings to concur with the corrected materials that contradict the findings they shared with media outlets.
NBC News, which reported on the uncorrected version of the study on July 14, criticized U.S. Health Secretary Robert F. Kennedy Jr. for saying during a 2024 “Joe Rogan Experience” interview that the aluminum in vaccines is “extremely neurotoxic.”
Last month, Kennedy appointed new members to the Centers for Disease Control and Prevention’s (CDC) vaccine advisory committee. Last month, during the first meeting of the new members, they voted to remove thimerosal, a preservative that contains mercury, from vaccines. On Wednesday, the U.S. Department of Health and Human Services said it formalized the recommendation.
Reuters reported that Kennedy also considered asking the committee to examine vaccines that contain aluminum, but to date, the CDC has not announced any new recommendations related to aluminum.
Danish researchers ‘completely obfuscated what they really found’
According to the authors of the Danish study:
“This nationwide cohort study did not find evidence supporting an increased risk for autoimmune, atopic or allergic, or neurodevelopmental disorders associated with early childhood exposure to aluminum-adsorbed vaccines.”
However, after reviewing the corrected data, Brian Hooker, Ph.D., CHD’s chief scientific officer, told The Defender the authors “completely obfuscated what they really found — a statistically significant relationship between aluminum exposure and autism.”
The buried link appears on Figure 11 (page 19) of the corrected supplemental materials.
The original version showed that children who received a large dose of aluminum were not at greater risk of getting a neurodevelopmental diagnosis, including autism, than kids who received a small or moderate dose.
Yet the corrected version showed that kids who received a large dose had a statistically significantly higher risk of being diagnosed with autism or other “pervasive” developmental disorders compared to those who received a moderate dose of aluminum.
Jablonowski said he and Hooker determined that the results were statistically significant — meaning they couldn’t be attributed to chance — by looking at the confidence intervals for each statistic.
A confidence interval “shows the range of values you expect the true estimate to fall between if you redo the study many times.”
The corrected figure also showed that children who received a large dose of aluminum had a statistically significantly higher risk of Asperger’s syndrome compared to kids who received a small dose of aluminum. However, kids in the large-dose group weren’t at a higher risk of any other neurodevelopmental issues compared to kids who received a small dose.
The low-dose group included roughly only 42,000 children. That could make it difficult to detect a statistical signal, Jablonowski explained.
“It’s not surprising that we see a strong signal among the groups that had more participants but not among the group that had fewer participants,” he said.
The moderate-dose group consisted of about 700,000 children, while there were about 460,000 children in the large-dose group.
How did authors make autism link disappear from original figure?
The original version of the study reported 2,961 fewer diagnoses of neurodevelopmental outcomes than the corrected version.
It appears the study authors “deleted the sicker kids,” Jablonowski said. “Or at least, just their diagnoses.”
The study also included allergy and autoimmune diagnoses, but none of those statistics were missing. Only the number of neurodevelopmental diagnoses differed between the original results and the corrected ones.
That suggests the authors didn’t make a random mistake, but intentionally fudged the number, Jablonowski said.
In hope of shedding light on what happened to the missing data, Jablonowski emailed the journal’s editors on July 18, asking them to publicize the comments between themselves and the anonymous scientists who peer-reviewed the study.
The inconsistencies in the study are specifically in “the figures in the main manuscript and the figures in the supplemental material,” Jablonowski wrote to the journal. “I believe the nature of those inconsistencies may be understood by examining the reviewer comments and subsequent exchanges.”
The journal editors have not responded.
‘Glaring signs’ Danish authors ‘didn’t practice good science’
The authors have not released the study’s raw data, citing Danish privacy law.
This frustrates independent scientists like Jablonowski, who said having access only to the data that the authors statistically adjusted makes it difficult to accurately critique the study, and impossible to replicate it.
Andersson did not respond when The Defender asked if the authors could share a de-identified version of the data that wouldn’t violate privacy law.
Jablonowski said:
“So if the raw data can’t be shared and Andersson is not going to reveal their unadjusted data, the appraisal of this paper is solely based on trust that the authors are practicing good science in good faith and they do not need to be scrutinized.”
But there are “glaring signs that the authors didn’t practice good science,” he said.
There were other inconsistencies between the original and corrected supplemental material. For instance, the corrected version shows different results in multiple places when tracking the prevalence of Asperger’s syndrome among kids.
The authors may have been more inclined to produce results that favored vaccination, given that they work at the Statens Serum Institut, a government agency responsible for procuring and supplying vaccines for the national vaccination.
Hviid reported funding from the Novo Nordisk Foundation, which is directly linked to the pharmaceutical giant Novo Nordisk.
“The researchers are integrally involved in pushing vaccines and sweeping vaccine safety under the rug.”
Original study also riddled with flaws, critics say
Even before the corrected materials were added to the study, Hooker and Jablonowski noted a host of flaws.
For instance, the authors failed to mention there were increased risks of certain diseases for kids vaccinated with aluminum-containing vaccines, compared with kids who received no aluminum-containing vaccines.
Before Hviid went on summer break, he told The Defender in an email that his team didn’t include a control group of unvaccinated children who had no aluminum exposure because differences between unvaccinated and vaccinated children likely would have biased the results.
Instead, the team opted to compare groups of vaccinated children who were exposed to different amounts of aluminum, Hviid said.
Yet the study reported results for 15,237 children who were either unvaccinated or vaccinated only with a shot that contains no aluminum, such as the measles-mumps-rubella (MMR) vaccine. The MMR vaccine used in Denmark has no aluminum, according to the authors.
That creates a cohort of children unvaccinated with an aluminum-containing shot, Jablonowski said.
Hooker and Jablonowski compared the outcomes of children who didn’t receive an aluminum-containing vaccine with the outcomes of children who received aluminum-containing vaccines.
“Kids who received an aluminum-containing vaccine were 26% more likely to have atopic dermatitis” than kids who were unvaccinated or only got the MMR shot, Jablonowski said. Those kids were “50% more likely to have allergic rhinoconjunctivitis — and these are really strong, statistically significant signals.”
Jablonowski said the study authors might criticize the analysis he and Hooker conducted for failing to consider possible confounding factors.
“I’d be happy to redo the analysis and account for possible confounding factors, but I’d need the authors to release sufficiently detailed data,” Jablonowski said.
Calls grow for journal to retract study
The findings in the corrected study still maintain the authors’ claim that aluminum-containing vaccinations are not associated with all 50 of the negative health outcomes they analyzed. In fact, their analysis claims protection against 12 categories of disease, including autism.
“These findings are not just counterintuitive — they are biologically absurd,” James Lyons-Weiler, Ph.D., wrote on Substack. “No plausible mechanism exists by which aluminum salts could prevent neurodevelopmental delay.”
Lyons-Weiler is the founder of IPAK-EDU, an adult online institution of higher learning run by the Institute for Pure and Applied Knowledge.
Lyons-Weiler and other critics are calling for the study’s retraction. He told The Defender the study’s “fatal methodological flaws … violate the principles of valid causal inference.”
Guillemette Crépeaux, Ph.D., associate professor at École Nationale Vétérinaire d’Alfort, told The Defender that the Annals of Internal Medicine should never have accepted the study — especially with its incorrect supplementary data. “Retraction should be the bare minimum,” she said.
Guillemette said she and her colleagues are writing a rebuttal to the study. They plan to submit it for publication later this summer.
Chris Exley, Ph.D., one of the world’s leading experts on the health effects of aluminum exposure, told The Defender, “There is no question in my mind that the authors of this study used the data available to them to come to an afore determined conclusion.”
In 2020, Crépeaux and Exley co-authored an article in the Journal of Trace Elements in Medicine and Biology that called for “independent, rigorous and honest science” on aluminum in vaccines.
Exley said the authors of the Danish study should make the data they used available for independent scrutiny. He said:
“I understand that they have already refused such requests and the compliant journal publishing the study is not prepared to press them on this issue. Surprise, surprise.
“Hviid and his band of conspirators are only interested in pedaling nonsense and nonscience to what they and others … believe is a gullible public. I think we have news for them. The times are changing, at long last.”
Related articles in The Defender
- Study Claiming No Link Between Aluminum in Vaccines and Autism Riddled with Flaws, Critics Say
- 4 Things the New York Times Got Wrong About Aluminum in Vaccines
- 5 Scientific Findings Explain Link Between Vaccines and Autism — Why Do Health Agencies Ignore Them?
- 36% Higher Risk of Asthma in Some Kids Who Had Vaccine-Related Aluminum Exposure, CDC Study Shows
- Study Showing 13% of Kids Have 2 or More Allergy-Related Conditions Overlooks Role of Aluminum and Vaccines
This article was originally published by The Defender — Children’s Health Defense’s News & Views Website under Creative Commons license CC BY-NC-ND 4.0. Please consider subscribing to The Defender or donating to Children’s Health Defense.
Study Claiming No Link Between Aluminum in Vaccines and Autism Riddled with Flaws, Critics Say
By Suzanne Burdick, Ph.D. | The Defender | July 17, 2025
Mainstream media widely promoted a new study by Danish researchers that found no link between aluminum in vaccines and 50 negative health outcomes, including autism, asthma and autoimmune disorders.
However, critics told The Defender the study used flawed methodology and “statistical tricks” that muddied the findings.
The authors published their report on July 15 in the Annals of Internal Medicine. On July 14, even before the study went live, mainstream and health industry media, including NBC News and STAT News, publicly announced the results.
Chris Exley, Ph.D., one of the world’s leading experts on the health effects of aluminum exposure, and Brian Hooker, Ph.D., chief scientific officer of Children’s Health Defense (CHD), said that in order to determine if aluminum exposure is linked to health conditions, the researchers should have compared children with no aluminum exposure to children with aluminum exposure.
But that’s not what the Danish scientists did. Instead, they compared children who received vaccines containing aluminum to children who received vaccines with slightly less aluminum.
Not only that, but there was only a one-milligram difference between the amount of aluminum in the vaccine doses received by the children in one of the groups compared to those in another group. Comparing children with similar aluminum levels rather than comparing children with low levels of aluminum to children with high levels of the metal further muddled the findings, Hooker said.
The researchers examined national vaccination records of about 1.2 million children born in Denmark between 1997 and 2018 and tracked the rates of 50 chronic health conditions.
Using statistical analyses, the authors concluded there was no link between aluminum content in vaccines and increased risk of developing autism, autoimmune diseases, asthma or allergic conditions, including food allergies and hay fever.
Anders Hviid, a professor and department head of epidemiology at the Statens Serum Institut and lead study author, told MedPage Today, the results “provide robust evidence supporting the safety of childhood vaccines.”
“This is evidence that parents, clinicians, and public health officials need to make the best choices for the health of our children,” Hviid said.
In a press release, Hviid called the results “reassuring” and said large studies like his are important in “an era marked by widespread misinformation about vaccines.”
According to Hviid, the aluminum in vaccines is in the form of aluminum salts, “which is not the same as elemental aluminum which is a metal.” He told NBC News, “It’s really important for parents to understand that we are not injecting metal into children.”
Hviid justified the choice not to include a control group of children with no aluminum exposure by saying there are “very few” children who are “completely unvaccinated.”
The study came out just weeks after Health Secretary Robert F. Kennedy Jr. considered asking the Centers for Disease Control and Prevention’s (CDC) vaccine advisory committee to review vaccines containing aluminum ingredients, according to Reuters.
Aluminum-containing adjuvants are used in many vaccines to create a stronger immune response in the person receiving the shot, according to the CDC. Vaccines containing aluminum adjuvants include DTP (diphtheria, tetanus, pertussis), hepatitis A, hepatitis B, Haemophilus influenzae type b (Hib), HPV and pneumococcal.
Kennedy previously suggested that aluminum may be partially responsible for the rise in allergies among U.S. kids, according to The New York Times.
J.B. Handley, author of “How to End the Autism Epidemic,” said aluminum in vaccines may trigger autism and other neurodevelopmental disorders by activating the immune system in a way that alters the developing brain of a fetus or child.
This happens because the aluminum in vaccines travels easily to the brain. There, it can cause inflammation in vulnerable people by triggering the production of a key cytokine — interleukin 6 or IL-6 — a protein that affects the immune system. Elevated IL-6 has been linked to autism.
Is aluminum industry running scared?
The new Danish study affirms that aluminum is safe — a convenient narrative for the aluminum industry and one that has come under greater scrutiny since Kennedy became head of the U.S. Department of Health and Human Services.
“I spent forty years of academic research on aluminium and I never really believed that I would see the day when the aluminium industry was running scared,” Exley wrote on Substack about the media response to the Danish study. “This is what is happening now.”
Exley said he suspects the aluminum industry influenced the Danish researchers. Hviid pushed back on the claim, telling The Defender he and his co-authors have no financial ties to the aluminum industry.
The study’s authors are employed by the Statens Serum Institut, which has a long history of developing vaccines, Hooker said. “The researchers are integrally involved in pushing vaccines and sweeping vaccine safety under the rug.”
Researchers excluded kids most likely to show early signs of aluminum-related injury
Failing to have a control group with no aluminum exposure was one of several criticisms leveled at the Danish study.
James Lyons-Weiler, Ph.D., wrote a lengthy Substack post detailing numerous methodological problems. He is president and CEO of the Institute for Pure and Applied Knowledge, an advocacy group that supports accuracy and integrity in science.
Lyons-Weiler said the study’s authors adjusted for children having aluminum-related chronic illness before 24 months, which meant they removed the kids most likely to show early signs of aluminum-related injury.
He explained how this was a “statistical trick”:
“Imagine studying the association between smoking and lung disease, adjusting for having nicotine-stained fingers, carrying a lighter, or frequency of coughing in the 24 months before lung cancer diagnosis.
“What you are doing, in effect, is mathematically erasing the very signal you are supposed to be detecting.”
Karl Jablonowski, Ph.D., CHD’s senior research scientist, noted that over 34,000 children were excluded from the study because they received more than three of any one of the aluminum-containing vaccines before their second birthday. The study described this as an “implausible number of childhood vaccines.”
“Was this a documentation error or a medical error?” Jablonowski asked. “The group had the opportunity to investigate the health of these children and chose not to.”
Recommendations for aluminum-containing vaccines are higher in the U.S. than in Denmark. Before a child turns 2 years old, the U.S. Child and Adolescent Immunization Schedule calls for four doses of DTaP, four doses of pneumococcal, three or four doses of Hib, three doses of hepatitis B and one dose of hepatitis A. Other vaccines that don’t contain aluminum are also recommended.
Researchers stopped following kids’ diagnoses at age 5
Hooker cited another flaw in the study: the authors tracked chronic disease diagnoses in children only from ages 2-5. It’s possible some of the kids were older than age 5 when they were diagnosed with a health condition, but by then, researchers were no longer tracking them.
“This is much too young for developmental and autoimmune diagnoses and will cause everything to move to the null hypothesis,” he said.
For example, the number of autistic kids in the study was only about 1 in 500, “which we know is much too low,” Hooker said. Denmark’s autism rate is over four times that amount, according to data from World Population Review.
Additionally, the researchers did nothing to ensure that the kids in the study were exposed to the amounts of aluminum that the authors assumed, based on the kids’ vaccination records.
“There were no biomarkers, no aluminum levels measured in serum, hair or tissue,” Lyons-Weiler told The Defender.
Prior research links aluminum to neurotoxicity, asthma
The results of the new Danish study stand in contrast to the findings of other researchers on aluminum’s negative health impacts, according to Lyons-Weiler.
“The literature contains multiple lines of evidence implicating aluminum adjuvants in neurotoxicity, immune dysregulation and developmental injury,” he said. “The consistency of these findings — across model systems, exposure levels and endpoints — demands attention, not erasure.”
In 2023, a federally funded U.S. study found a 36% higher risk of persistent asthma in children who received three or more milligrams of vaccine-related aluminum than kids who got less than three, but the study’s authors were careful not to suggest a causal relationship.
Exley said he hopes Kennedy will commission independent research that will provide “unequivocal” evidence on aluminum’s role in infant mortality and ill health.
Lyons-Weiler added, “The public deserves studies that test hypotheses honestly, not ones built to produce desired headlines.”
Related articles in The Defender
- 4 Things the New York Times Got Wrong About Aluminum in Vaccines
- 36% Higher Risk of Asthma in Some Kids Who Had Vaccine-Related Aluminum Exposure, CDC Study Shows
- 5 Scientific Findings Explain Link Between Vaccines and Autism — Why Do Health Agencies Ignore Them?
- Study Showing 13% of Kids Have 2 or More Allergy-Related Conditions Overlooks Role of Aluminum and Vaccines
This article was originally published by The Defender — Children’s Health Defense’s News & Views Website under Creative Commons license CC BY-NC-ND 4.0. Please consider subscribing to The Defender or donating to Children’s Health Defense.
EXPERTS CONCEDE ‘VACCINES DO NOT CAUSE AUTISM’ IS NOT SUPPORTED BY SCIENCE
The HighWire with Del Bigtree | April 17, 2025
Jefferey Jaxen exposes the myth that the science on vaccines and autism is “settled.” Despite repeated claims, the CDC and FDA have failed to produce credible long-term studies proving vaccines don’t contribute to autism, while top experts admit under oath that no such studies exist.
‘Genes Do Not Cause Epidemics’: Kennedy Lambastes Media for Denying Autism Epidemic, Vows to Research Environmental Triggers
By Brenda Baletti, Ph.D. | The Defender | April 16, 2025
U.S. Health and Human Services (HHS) Secretary Robert F. Kennedy Jr. today criticized mainstream media for pushing the narrative that rising autism rates are just a result of better diagnosis.
“One of the things that I think we need to move away from today is this ideology that autism diagnosis, that the autism prevalence increases, are simply artifacts of better diagnosis, better recognition, or changing diagnostic criteria,” Kennedy said at his first press conference since taking office.
HHS called the press conference to share results of the latest study by the Centers for Disease Control and Prevention (CDC) on autism prevalence, published yesterday.
An estimated 1 in 31 (3.22%) 8-year-old children had an autism spectrum disorder (ASD) diagnosis in 2022 — up from 1 in 36 (2.8%) in 2020, the CDC said in its latest report from the Autism and Developmental Disabilities Monitoring Network (ADDM), which is published every two years.
Overall, the prevalence of autism in U.S. children rose approximately 17% between 2020 and 2022, continuing a decades-long trend.
The mainstream media responded in lockstep to yesterday’s report by denying that autism is an epidemic and doubling down on the argument that rising rates are simply the outcome of better diagnosis. The Washington Post called the 17% increase “small,” and The Hill labeled it a “slight” increase.
Kennedy responded today, saying the rate increases “are real,” and that each year there has been “a steady, relentless increase.” Kennedy said that while some people may be genetically predisposed to autism, it takes an environmental exposure to trigger the condition.
He added:
“This epidemic denial has become a feature in the mainstream media, and it’s based on an industry canard. Obviously, there are people who don’t want us to look at environmental exposures.”
Kennedy shared data from other previous studies on autism prevalence, including a 1987 study from North Dakota, in which researchers attempted to identify every child with autism in the state. In 1987, 330 out of every 1 million kids were diagnosed with autism. “Today there are 27,777 for every million,” he said.
“If you accept the epidemic denier’s narrative, you have to believe that researchers in North Dakota missed 98.8% of the children with autism,” Kennedy added. “Thousands of profoundly disabled children were somehow invisible to doctors, teachers and parents.”
“Doctors and therapists in the past were not stupid,” Kennedy added. “They weren’t missing all these cases.”
Kennedy also underscored that a high and growing percentage of children diagnosed with autism were severe cases. In a press release Tuesday, HHS outlined specific numbers:
“The increase in autism spectrum disorder (ASD) prevalence cannot be solely attributed to the expansion of diagnoses to include higher functioning children. On the contrary, the percentage of ASD cases with higher IQs (> 85) has decreased steadily over the last six ADDM reports to 36.1% in the 2022 survey. Nearly two-thirds of children with ASD in the latest survey had either severe or borderline intellectual disability (ID).”
“So we know what the historic numbers are and we know what the numbers are today, and it’s time for everybody to stop attributing this to this ideology of epidemic denial,” Kennedy said today.
He called out the National Institutes of Health for spending 10 to 20 times more on research into genetic causes than into environmental ones, and pledged that under his leadership, that will change. He said HHS will make grants available to university scientists and others to research the environmental causes of autism.
“People will know they can research and they can follow the science no matter what it says, without any kind of fear that they’re going to be censored, that they’re going to be gaslighted, that they’re going to be silenced, or that they’re going to be delicensed.”
“This is a preventable disease,” Kennedy said. “We know it’s an environmental exposure. It has to be. Genes do not cause epidemics.”
One of the authors of the CDC study, and head researcher of the ADDM’s New Jersey site, Walter Zahorodny, Ph.D., from Rutgers Medical School, joined Kennedy at the press conference. Zahorodny said autism should be treated “as an urgent public health crisis.”
Zahorodny said:
“There is better awareness of autism, but better awareness of autism cannot be driving a disability like autism to increase by 300% in 20 years. That’s what we saw in New Jersey. That’s what the CDC report of yesterday indicates. And that’s what, in my opinion, future reports from epidemiologists will show.”
Zahorodny said a lot of data had been collected over 20 years, indicating that the “epidemic, tsunami, or a surge in autism” is significant. But no real progress had been made in understanding the environmental risk factors.
Children’s Health Defense Chief Scientific Officer Brian Hooker told The Defender he was “very encouraged” by Kennedy’s response to the latest autism prevalence report.
“The magnitude of the autism epidemic is staggering and the ‘better diagnosing’ reasoning for the increase in prevalence is utter nonsense and has been debunked ad infinitum.”
“Secretary Kennedy has demonstrated his commitment to address this issue directly. I look forward to not only answers but real solutions on how to clean up the mess created by a prior HHS that couldn’t care less about autistic children and adults,” he added.
This article was originally published by The Defender — Children’s Health Defense’s News & Views Website under Creative Commons license CC BY-NC-ND 4.0. Please consider subscribing to The Defender or donating to Children’s Health Defense.
CDC Will Study Possible Link Between Vaccines and Autism, Pledges to ‘Leave No Stone Unturned’
By Michael Nevradakis, Ph.D. | The Defender | March 10, 2025
The Centers for Disease Control and Prevention (CDC) confirmed it plans to study the possible link between vaccines and autism, after Reuters reported on the plan late Friday, citing two sources inside the agency.
In response to the Reuters story, the CDC and the U.S. Department of Health and Human Services (HHS) provided an identical statement:
“As President Trump said in his Joint Address to Congress, the rate of autism in American children has skyrocketed. CDC will leave no stone unturned in its mission to figure out what exactly is happening. The American people expect high quality research and transparency and that is what CDC is delivering.”
The revelation came days after President Donald Trump, in an address to Congress, referred to the rising rate of autism in the U.S. Trump, citing CDC data showing that 1 in 36 U.S. children have autism, said HHS Secretary Robert F. Kennedy Jr., is well suited to lead efforts to study the increase.
“There’s something wrong,” Trump said. “So, we’re going to find out what it is, and there’s nobody better than Bobby [Kennedy] and all of the people that are working with you.”
According to The Washington Post, Trump administration officials asked the CDC to perform the study. Newsweek reported that it is “unclear” whether Kennedy is involved in the new study. However, HHS oversees federal health agencies, including the CDC.
Karl Jablonowski, Ph.D., Children’s Health Defense (CHD) senior research scientist, applauded “the CDC’s newfound curiosity in vaccines and autism.” He said the U.S. “passed an inflection point” in the 1990s, where autism “went from being a rare disease to a more common one” that has been “increasing exponentially ever since.”
“When is an appropriate time to conduct a large study on vaccines and autism? Apparently, two generations later,” Jablonowski said.
Sayer Ji, chairman and co-founder of the Global Wellness Forum, called the news a “pivotal moment, not just in the scientific exploration of vaccine safety, but in the broader issue of public trust in our institutions.”
Ji said the CDC’s plan for a large-scale study “is an implicit admission that prior investigations may have been insufficient, biased or incomplete.” He said the new study “could represent a breakthrough moment” in “resolving this critical health question” and “restoring faith in the integrity of scientific inquiry itself.”
‘A seismic shift toward accountability’
According to the Post, the CDC will conduct the study using data from the Vaccine Safety Datalink, a database of patient health records. The Vaccine Safety Datalink draws on data from 13 U.S. healthcare organizations, CNN reported.
Biologist Christina Parks, Ph.D., said the study should examine the CDC’s childhood vaccination schedule.
“The cumulative effect of giving multiple vaccines at once as well as over a short period of months has not been studied as a potential contributing factor to autism,” Parks said. “Vaccines have the potential to alter a child’s immune system in ways that are unexpected.”
Parks referred to studies performed in 1970 and 1987 that found autism rates of 0.7 and 3.3 children per 10,000, respectively. “If autism were as prevalent then as it is now, we should have a large number of older autistic adults, which we do not,” Parks said.
Brian Hooker, Ph.D., chief scientific officer for CHD, suggested the CDC study should use an unvaccinated control group. Hooker cited his experience performing research using data from the Vaccine Safety Datalink, noting that the database already contains data on unvaccinated children.
A 2021 study co-authored by Hooker found that vaccinated children were significantly more likely than unvaccinated children to be diagnosed with autism.
Ji said any CDC study examining a possible vaccine-autism link should reflect Kennedy’s recent calls for “gold-standard science.”
He said:
“It must be a true gold-standard study. The methodology must be rigorous, transparent and independent, with no industry or government interference. It should be a prospective, controlled, long-term study comparing fully unvaccinated and vaccinated populations.”
Hooker said the CDC has previously not made data from the Vaccine Safety Datalink available to the public, even though it is taxpayer-funded.
“We’ve never had access to the Vaccine Safety Datalink. We’ve never had access to such a gold-standard database, and that thing takes $50 million worth of tax dollars to maintain every year. It should be open to the public,” Hooker said.
Ji said many past vaccine safety studies were flawed due to a lack of transparency.
“Historically, vaccine safety studies have been marred by selective reporting, data manipulation and redacted findings. Kennedy has long advocated for open access to government data, and if this study follows through on that promise, it would be a seismic shift toward accountability,” Ji said.
Rise in autism cannot simply be attributed to ‘better diagnosis’
Reuters attributed the rise in autism rates to “more widespread screening and the inclusion of a broader range of behaviors to describe the condition.”
Research scientist and author James Lyons-Weiler, Ph.D., said such claims are “pure disinformation.”
“No rigorous study has shown that these factors are responsible,” Lyons-Weiler said.
“These criteria cannot explain the 7% increase in autism following the removal of vaccine exemptions from California, which has 1 in 22, the highest rate among all states,” Lyons-Weiler said.
Ji said that prior studies claiming to debunk the vaccine-autism link should be called into question, noting that many such studies “suffer from conflicts of interest, flawed methodologies and a lack of truly unvaccinated control groups.”
According to Hooker, many previous studies were flawed because they focused only on a limited number of vaccines and vaccine components.
“The CDC and most of the open peer-reviewed literature focuses on one vaccine and one vaccine component, the MMR [measles-mumps-rubella] vaccine and thimerosal” — a mercury-based preservative used in some vaccines. A 2013 study found a link between thimerosal exposure and the risk of an autism diagnosis.
Recent independently performed studies have indicated a connection between vaccines and autism.
A peer-reviewed study published in Science, Public Health Policy and the Law in January found that vaccinated children have a 170% higher chance of being diagnosed with autism compared to unvaccinated children. The study also found that the autism risk increases in children with a higher number of vaccinations.
A ‘new era of openness’
Reuters quoted Dr. Wilbur Chen, a professor at the University of Maryland School of Medicine and former member of the CDC’s vaccine advisory panel, who suggested the CDC’s new study could fuel vaccine hesitancy.
“It sends the signal that there is something there that is worth investigating, so that means there must be something going on between vaccines and autism,” Chen said.
But other experts suggest that such statements conceal concerns that vaccines may not be as safe as frequently claimed.
“Americans and those who receive our vaccines overseas should be able to have confidence that American products, especially biologics that are injected into children, meet the highest safety standards,” Parks said. “By addressing parent concerns, the CDC can help to reestablish trust in its guidelines.”
“If the vaccines are safe, transparency should increase confidence, not the opposite,” Ji said. “If vaccines are as safe as claimed, then the data should confirm that and bolster confidence. The fear of ‘hesitancy’ suggests a deeper concern that the results may contradict the official narrative.”
Hooker said the new CDC study is representative of a “new era of openness” and will “encourage greater faith in our institutions and their recommendations regardless of where they fall.”
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