December 13, 2024 - 6:30pm

In an interview with Time magazine published this week, Donald Trump mooted a review of childhood vaccination programmes when he returns to office in January. By way of explanation, he invoked the notable increase in autism diagnoses in recent years. “The autism rate is at a level that nobody ever believed possible,” he said. “If you look at things that are happening, there’s something causing it.”

Although he demurred when asked if he believed that childhood autism was definitely linked to vaccines, Trump said that he would be “listening to Bobby”. That’s Robert F. Kennedy Jr, his likely head of Health and Human Services, who has spent years talking up the link between vaccines and autism.

There is no doubt that autism rates are increasing. According to the Centers for Disease Control and Prevention, 6.7 in every thousand American children were diagnosed with autism spectrum disorder (ASD) in 2000, but that had risen to 27.6 per thousand by 2020. In the UK, meanwhile, a 2021 study found that diagnoses had risen by 787% between 1998 and 2018, with one in 36 children now believed to have ASD.

There are three possible explanations for the rise in autism diagnoses, all of which may be true. First, there may have been an increase in accurate diagnoses due to greater awareness, an increase in the number of clinicians specialising in the condition, and an increase in previously under-diagnosed groups being able to receive a diagnosis, including the middle-aged, women, working-class patients, and non-white people.

Second, the rise may be due to “over-diagnosis”, with the definition of “autistic” loosened to encompass everyone from the severely disabled to those whose symptoms might more properly be understood as aspects of their personality, rather than a pathology.

Third, it may be the case that there actually has been an increase in incidences of autism due to environmental factors such as pollution, viral infections in childhood, vitamin deficiencies, increasing parental age — or even, potentially, vaccines.

As it stands, there is no evidence that vaccines are responsible, with a 2014 meta-analysis of studies involving more than 1.2 million children finding no connection between inoculations and autism

Unfortunately, this issue involves politics as much as it does medicine. And since both vaccine scepticism and scepticism about the increasing rates of neurodiverse conditions such as ASD and ADHD are associated with conservative views, it puts many on the Left in an awkward position. Since there clearly has been a massive increase in autism diagnoses, how can we account for it?

There is a long history of liberals and socialists expressing scepticism of state-led or -mandated medical interventions; many remain doubtful, even if they keep their views to themselves. Today, many people who might have taken up these issues only a few years ago won’t touch them due to their association with the likes of RFK Jr, Trump, and Covid conspiracists. This means there is a risk that, as with debates about the efficacy and risks of Covid lockdowns, important points are ignored because of the types of people making them.

It is also increasingly hard to argue that there are large numbers of people walking around undiagnosed. Despite long waiting lists, there is now a much greater awareness of the condition. This can be seen in the frequency with which ASD is invoked by defence lawyers, from those who stormed the US Capitol, to the rioters in England this summer, to a huge number of the alleged perpetrators of youth knife crimes, such as the suspect in the murder of Elianne Andam. Therefore, if the rate continues to increase over the next few years and decades, it will be increasingly difficult to attribute this to an rise in accurate diagnoses.

The worst-case scenario is that there might actually be some truth to medical interventions increasing the likelihood of autism, and that these arguments are not receiving a fair hearing due to the politics of people making them.


David Swift is a historian and author. His next book, Scouse Republic, will be published in 2025.

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