The Autism Myth Factory: Vaccines, Tylenol, and Political Spin

What the F* just happened?

Americans watched their President and his Secretary of Health stand at a podium spitting lies and half-truths about the causes of autism. The consequences will not be measured in applause lines but in psychological harm and children’s lives.

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What Was Claimed

Trump and RFK Jr. announced “historic steps” to confront autism. Among the highlights:

• “Don’t take Tylenol. Don’t give Tylenol to your baby. It’s not good.” (Trump)
• “The Amish don’t take all this junk… they have no autism.” (Trump)
• “Autism rates have risen 400%… it’s artificially induced.” (Trump)
• Vaccines should be “broken up” or delayed; Hepatitis B shouldn’t be given until age 12.
• “We are replacing politicised science with evidence-based medicine.” (RFK Jr.)

It sounded less like a science briefing and more like a rally cry from the tin foil hat movement.

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Quick Myth vs Fact Check

Fact: Autism, or autism spectrum disorder (ASD), is a neurodevelopmental condition that affects how people communicate, interact socially, and process information, often alongside restricted or repetitive behaviours. It is a spectrum, meaning it varies widely in presentation and support needs, from subtle differences in social understanding to significant challenges in daily living. Many autistic people show exceptional skills in areas like pattern recognition, memory, focus, creativity, or detail-oriented thinking, and some thrive in science, art, technology, or problem-solving because of these traits. Note it was first described in the 1930’s before the widespread use of modern vaccines and the advent of Tylenol.

Claim: Autism rates have exploded, proving an epidemic.
Fact: The increase is largely due to broadened diagnostic criteria, better recognition, and awareness. There is no evidence of a true epidemic.

Fact: All populations have people with autism [Autism rates by country]

Claim: Amish communities and Cuba have no autism.
Fact: Amish communities: The myth that “the Amish don’t have autism” has been recycled in antivaccine circles for decades. In reality, autism is documented among the Amish. Reports from clinicians and researchers working in these communities confirm diagnoses, though at lower reported prevalence because of under-diagnosis, limited healthcare access, cultural differences, and stigma. Many Amish families don’t seek or record medical diagnoses in the same way mainstream populations do, so cases are often hidden from statistics.

Cuba: Autism is also present in Cuba. What fuels the myth is that Cuba has a highly centralised healthcare system with fewer published epidemiological studies, and diagnostic resources for neurodevelopmental conditions are less developed than in high-income countries. This creates the appearance of “low autism rates,” but it reflects diagnostic infrastructure gaps rather than the absence of autism.

Fact: There are some contributors to autism that have been identified. These are risk factors, not causes on their own: Parental age: Older maternal and paternal age are modestly associated with higher autism risk. Pregnancy factors: Maternal illness, severe infections, exposure to certain medications (e.g. valproic acid, thalidomide), or extreme prematurity can increase risk. Prenatal environment: Poor intrauterine conditions, metabolic issues (like gestational diabetes), or toxic exposures (e.g. high air pollution) are under study. Perinatal events: Complications during birth, low birthweight, or neonatal hypoxia show weak but consistent associations.

Claim: Acetaminophen (Tylenol) in pregnancy causes autism.
Fact: Evidence is inconsistent and confounded. Fever itself poses more risk than acetaminophen. Regulatory bodies (FDA, EMA, ACOG) continue to endorse its safety in pregnancy. The most rigorous study available to date, which included 2.5 million children from Sweden, found no association. Key finding: “Acetaminophen use during pregnancy was not associated with children’s risk of autism, ADHD, or intellectual disability in sibling control analyses. This suggests that associations observed in other models may have been attributable to confounding.”

Trends in acetaminophen (Tylenol) use during pregnancy and autism prevalence in U.S. children, 2010–2018. Blue line: reported acetaminophen use in pregnancy (Bandoli et al., 2020, San Diego Mother’s Milk Study) shows a decline from ~70% to ~58%. Red line: autism prevalence in 8-year-olds from the CDC Autism and Developmental Disabilities Monitoring (ADDM) Network increased from ~1.5% (1 in 68) to ~2.3% (1 in 44). Together, these data show that autism diagnoses rose while acetaminophen use fell, contradicting claims of a causal link.

Fact: The idea of “splitting” or spacing out vaccines is based on the myth that children’s immune systems can’t handle more than one at a time — yet every scraped knee exposes them to far more microbes than any vaccine ever could. Multiple large studies show no difference in safety between combined and separated vaccines, but splitting them just leaves kids vulnerable for longer, like locking one door in your house while leaving the others wide open.

Claim: Vaccines should be spaced out or split to prevent autism.
Fact: Apart from a total absence of evidence for this absurd idea, large-scale studies of millions of children show no difference. Delays only increase the risk of measles, rubella, hepatitis B, and other serious diseases.

Fact: Thiomersal (thimerosal), a mercury-based preservative, was phased out of nearly all routine childhood vaccines in the U.S. and many other countries more than 20 years ago, leaving only trace amounts in some multidose flu shots. Dozens of large-scale studies have found no link between thiomersal and autism or other neurodevelopmental conditions. Its removal didn’t change autism rates, making it irrelevant to today’s prevalence — yet it continues to be recycled as a scare tactic to stoke vaccine fears.

Claim: Aluminium and mercury in vaccines cause autism.
Fact: Thimerosal was removed from childhood vaccines over 20 years ago. Autism rates didn’t decline. Aluminium exposure from vaccines is minuscule compared to everyday exposures and has been demonstrated to be very safe.

Fact: Hepatitis B is often passed from mother to baby during birth or early infancy, and without vaccination a newborn has up to a 90% chance of developing lifelong infection if exposed. Giving the HepB vaccine at birth and in infancy protects against this silent but serious virus, which can lead to cirrhosis and liver cancer later in life — and is a cornerstone of global hepatitis elimination programs.

Claim: Hepatitis B should be delayed until adolescence.
Fact: Babies can acquire hepatitis B at birth or through close household contact. Early vaccination prevents lifelong infection and cancer. This is not only a sexually transmitted infection.

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The Political Weaponisation of science

Weaponising science for political gain means cherry-picking or distorting research to inflame fear, create division, and build authority where none exists. It swaps careful evidence for convenient soundbites, turning complex questions into blunt tools — less about truth and more about rallying a base, undermining trust, and consolidating power. The gain is power. By sowing doubt about mainstream science, politicians can position themselves as the only “truth tellers,” drawing in disillusioned voters and cementing loyalty. It also creates a ready-made scapegoat — scientists, doctors, and public health agencies — so every problem can be reframed as elite failure while the politician presents themselves as the champion of “the people.” In short, fear and confusion are turned into political capital.

This press conference was not about science. It was about power.

• Autism was used as a prop to attack scientific institutions and delegitimise medical expertise.
• RFK Jr. framed mainstream research as “corrupt,” while simultaneously politicising it for his own agenda.
• The spectacle positioned Trump and Kennedy as truth-tellers who “dare” to ask questions, even while recycling myths disproven decades ago.

Have Autism rates exploded, proving an epidemic?

What the myth claims

The myth says autism has become vastly more common — exploded in prevalence — and this alone proves that something new is causing it (vaccines, Tylenol, environmental toxins, etc.). People claiming this almost always ignore or downplay how definitions, diagnostic practices, awareness, and screening have changed over time. The rates of diagnosis are what have changed. We now go looking for it more.

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What the evidence actually shows

1. Changes in diagnostic criteria
   Over the years, what counts as “autism” has broadened. Early descriptions (Kanner, 1943) focused on severe, classic autism (non-verbal, with intellectual disability). Over time:
   • Subtypes like Asperger’s syndrome, PDD-NOS (Pervasive Developmental Disorder — Not Otherwise Specified) were added. Then, in DSM-5 (2013), these subtypes were subsumed under one broad category: Autism Spectrum Disorder (ASD). Arizona Autism United
   • Thresholds for case definition have lowered: milder cases are now included. Behaviours once considered “quirky” or subclinical are now often diagnosable, particularly when parents or teachers seek support. Frontiers
2. Better awareness, screening, and case ascertainment
   • More screening in schools, more efforts in paediatric practice, greater public awareness (parents, educators, doctors are all more likely to recognise symptoms). Diagnotic Changes
   • Decreases in under-diagnosis in previously underserved populations (by race, class, gender). For example, children from racial/ethnic minority groups or girls historically under-diagnosed are now being more accurately captured in statistics. This inflates measured prevalence without necessarily meaning actual biological incidence rose. JAMA
3. Diagnostic substitution and earlier diagnosis
   • “Diagnostic substitution”: some children who might formerly have been diagnosed under different categories (e.g. intellectual disability, speech/language delays) are now diagnosed with ASD. Diagnotic Change
   • Diagnoses are happening at younger ages. The earlier you look, the more you “capture” milder, early-onset cases that previously were only diagnosed when symptoms were severe or late. 
4. Empirical data from the U.S. (ADDM Network) showing rising identified prevalence
   The CDC’s Autism and Developmental Disabilities Monitoring (ADDM) Network has documented increases. For instance:
   • In 2000, about 1 in 150 children aged 8 were identified with ASD. By 2020, that had risen to 1 in 36 children aged 8. In 2022, the estimate was ~1 in 31 children aged 8. CDC
   But importantly: “identified prevalence” is not the same as actual incidence. It reflects how many cases are being diagnosed, found, and reported — including those that might have been missed before. The data show greater increases in mild-and-moderate categories than in classic autism. Changing Faces of Autism
5. Studies quantifying how much of the rise is likely due to non-biological factors
   Some research estimates a large fraction of the increase in diagnosed/identified cases can plausibly be explained by diagnostic changes, “case ascertainment” (how aggressively we look for cases), earlier detection, etc. For example:
   • A study in California suggested that changes in diagnostic practices alone might account for up to ~1/3 of the increased prevalence. PMC
   • Other work (Germany, Denmark, etc.) shows earlier diagnosis and expanding definitions contributed heavily.

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The Real-World Harms of this political game

• Pregnant women may avoid acetaminophen, exposing themselves and their babies to uncontrolled fever, a known risk to pregnancy outcomes.
• Parents delaying or splitting vaccines will leave children unprotected against deadly diseases, inviting outbreaks. This has already begun.
• Families with autistic children are further stigmatised and fed false promises of “cures.”
• Women will worry that they have harmed their baby

This is not harmless rhetoric. It’s an agenda that puts lives at risk.

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What Science Actually Says

• Autism is complex, influenced by genetics and multiple environmental factors. Vaccines are not one of them.
• Acetaminophen remains the safest fever reducer during pregnancy.
• Vaccines protect against lethal diseases and have saved millions of lives worldwide.

Science has asked these questions — exhaustively. The answers are in.

Final thought

What families need is support, services, and inclusion. What they got last night was a circus. When politicians stand at a podium and tell parents not to trust science or their doctors, the result isn’t empowerment — it’s confusion, fear, and preventable harm.

Autism deserves research, compassion, and resources. It does not deserve to be weaponised as a campaign slogan.