Current Opinion from IOM on Autism and Vaccination

Some parents and families of children with autism believe that the Measles/Mumps/ Rubella (MMR) vaccine caused their children’s autism. These parents report that their children were “normal” until they received the MMR vaccine. Then, after getting the vaccine, their children started showing symptoms of autism. Because the symptoms of autism (an increasingly common neurodevelopmental problem) begin to occur around the same time as the child’s MMR vaccination, parents and families see the vaccine as the cause of the autism. However, just because the events happen around the same time does not mean that one caused the other. Although children receive many other vaccines in addition to the MMR vaccine, these other vaccines have not been identified as possible causes of autism.

This has remained and despite the IOM findings below will probably continue to remain a highly emotive area, with neither side finding complete satisfaction in outcome.

Adverse Effects of Vaccines: Evidence and Causality a consensus report published August 25th 2011.[1]

So what do the Institute of Medicine (IOM) findings primarily describe:

They agree: There’s convincing evidence that some vaccines can cause some adverse effects, including seizures, brain inflammation, and fainting. But their 600 pages plus paper also favours rejecting the idea that some vaccines cause type 1 diabetes or autism.

The report was commissioned in 2009 by the Health Resources and Services Administration, which administers the Vaccine Injury Compensation Program. The agency asked the institute to review the evidence linking eight vaccines and a suite of possible adverse effects that have been the subject of compensation claims.

The expert panel chaired by Ellen Wright Clayton, MD, JD, of Vanderbilt University in Nashville, Tennessee found:  “convincing evidence” that 14 adverse effects can be caused by eight vaccines — those against varicella zoster, influenza, hepatitis B, hepatitis A, human papillomavirus (HPV), measles/mumps/rubella (MMR), and meningococcus, as well as tetanus-containing vaccines that do not carry the whole-cell pertussis component.

They stated that evidence “favours” the idea that vaccines can cause another four adverse effects and favors rejection of the causal link with five others, including autism and diabetes.

Finally they stated, evidence is inadequate to accept or reject a causal link in another 135 possible associations.

Categories of causation

The panel established four categories of causation, based on evidence that:

The committee reported convincing evidence that:

The experts found evidence “favouring” a causal link between HPV vaccine and anaphylaxis, as well as between the MMR vaccine and transient arthralgia in women and in children.

Also, the committee said, there’s evidence that favours a causal link between some trivalent inactivated influenza vaccines used in Canada recently and a mild and temporary syndrome, characterised by conjunctivitis, facial swelling, and upper respiratory symptoms.

Evidence favoured rejection of a causal link in five cases:


The panel cautioned that the “inadequate evidence” category might lead some people to conclude that, “because the committee did not find convincing evidence that the vaccine does cause the adverse event, the vaccine is safe.”

Others, they said, might take the opposite tack: because the committee did not find convincing evidence that the vaccine does not cause the adverse event, the vaccine is unsafe.

“Neither of these interpretations is correct,” the report concludes. “‘Inadequate to accept or reject’ means just that – inadequate.”

What do you think?


[1] Adverse Effects of Vaccines: Evidence and Causality a consensus report published august 25th 2011. View Report

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One Response to “Current Opinion from IOM on Autism and Vaccination”

  • Hannah Kaye says:

    There’s an interesting article in Ann Clinical Psychiatry – 2009 Jul-Sep; 21(3): 148 by Singh VK about Autoimmune Autistic Disorder. Findings as follows:
    1. Many autistic children harbored brain myelin basic protein autoantibodies and elevated levels of antibodies to measles virus and measles-mumps-rubella (MMR) vacine.
    2. Measles might be etiologically linked to autism because measles and MMR antibodies (a viral marker) correlated positively to brain autoantibodies (an autoimmune marker) – salient features that characterize autoimmune pathology in autism.
    3. The scientific evidence is quite credible for identification of Autoimmune Autistic Disorder (AAD) as a major subset of autism.

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