For as long as I can recall, this has been one of the clarion calls of the autism/antivaccine/pro-disease groups – that the only way to know if vaccines cause autism is to do a ‘simple’ study of vaccinated vs unvaccinated populations. Indeed, Generation Rescue carried out an ill-fated phone survey that in reality meant absolutely nothing so badly was it put together and carried out. But even if it _had_ been well designed and carried out the results were not good for pro-disease anti-vaccine autism believers:
Number of boys and girls with Aspergers
Unvaccinated: 1% of total
Partially vaccinated: 2% of total
Fully vaccinated: 1%
Fully and Partially combined: 2%
Conclusion: you are 1% more likely to have Aspergers if you have been partially vaccinated than unvaccinated. If you are fully vaccinated your chance of being Aspergers is no greater than if you were unvaccinated.
Number of boys and girls with PDDNOS
Unvaccinated: 2% of total
Partially vaccinated: 2% of total
Fully vaccinated: 1%
Fully and Partially combined: 1%
Conclusion: you are 1% more likely to have PDDNOS if you are unvaccinated. If you are fully vaccinated your chance of being PDDNOS is 1% less than if you were unvaccinated.
Number of boys and girls with Autism
Unvaccinated: 2% of total
Partially vaccinated: 4% of total
Fully vaccinated: 2%
Fully and Partially combined: 2%
Conclusion: you are 2% more likely to have autism if you have been partially vaccinated. If you are fully vaccinated your chance of being autistic is no greater than if you were unvaccinated.
Number of boys and girls with all ASD’s
Unvaccinated: 4% of total
Partially vaccinated: 6% of total
Fully vaccinated: 3%
Fully and Partially combined: 3%
Conclusion: you are 2% more likely to have an ASD if you have been partially vaccinated. If you are fully vaccinated your chance of being autistic is 1% less than if you were unvaccinated.
Overall conclusion: the best way to avoid being diagnosed with an ASD is to be fully vaccinated according to the CDC schedule.
And in September of last year, you may recall the announcement of yet another study that demonstrated there was no link between MMR and autism. During the press conference that launched that study David Kirby asked the lead author – Ian Lipkin – what his thoughts were about a vaccinated vs unvaccinated study. His answer was:
http://webjay.org/flash/dark_player
Very difficult if not impossible.
Given that, the US NVAC vaccine safety group released a draft of their latest thinking on the issue of vaccine safety which touched on the idea of doing this sort of study. The entire section related to this is quoted in full below:
Feasibility study of Vaccinated/Unvaccinated/Alternatively Vaccinated Children
Members of the public, stakeholders, and the Interagency Autism Coordinating Committee (IACC) have articulated interest in a study of vaccinated vs. unvaccinated children to determine if there are differences in health outcomes between groups with varying exposures to vaccines. The Working Group considered drafting a recommendation for an IOM review of the science, epidemiology and feasibility of studies of unvaccinated, vaccine delayed, and vaccinated children. The Writing Group Draft Document on Gaps in Research Agenda further developed this idea. The Working Group wishes to clarify several points on this topic. *First, the Working Group believes that the strongest study design, a randomized clinical trial that includes a study arm receiving no vaccine or vaccine not given in accord with the current recommended schedule, is not ethical, would not pass IRB review, and cannot be done*. The type of study that is being suggested would be an observational study of populations looking at natural variation in vaccination schedules including some children where vaccination is declined through parental intent. All children in the study should be recommended to receive the standard immunization schedule. The Working Group endorses the Writing Group’s recommendation for an external expert committee, such as the Institute of Medicine, with broad methodological, design, and ethical expertise to consider “strengths and weaknesses, ethical issues and feasibility including timelines and cost of various study designs to examine outcomes in unvaccinated, vaccine delayed and vaccinated children and report back to the NVAC.”
The Working Group does not necessarily agree with all of the language in the Writing Group’s statement, but with its general intent. The process should be open and transparent, engaging individuals from a broad range of sectors. Considerations as outlined by the Writing Group and modified by the Working Group are as follows:
– This review should consider strengths and weaknesses, ethical issues and feasibility including timelines and cost of various study designs and report back to the NVAC
– Consideration should be given to broad biomedical research including laboratory studies, and animal studies.
– Consideration should also be given to study designs comparing children vaccinated by the standard immunization schedule with unvaccinated children (by parental intention), and possibly partially vaccinated children or children vaccinated by alternative immunization schedules
– Outcomes to assess include biomarkers of immunity and metabolic dysfunction, and outcomes including but not limited to neurodevelopmental outcomes, allergies, asthma, immune-mediated diseases, and other developmental disabilities such as epilepsy, intellectual disability and learning disabilities.
– The inclusion of autism as an outcome is desired. This review should also consider what impact the inclusion of Autism Spectrum Disorders (ASD) as an outcome would have on study designs and feasibility, as referenced in the IACC letter to NVAC.
– This review should be conducted expeditiously, in a transparent manner, and involving broad public and stakeholder input.
So, as per a straight ‘vaccinated vs unvaccinated’ study, Ian Lipkin and NVAC Working Group agree that it can’t be done in the most scientifically accurate way and even if it could, it wouldn’t be ethical due to the requirement of excluding children from vaccination.
What they are saying is that a group like the IOM therefore should write up a feasibility study as to how such a study _could_ be done. Without this, its extremely unlikely that a vax vs unvax study will ever fly.
Amusingly, the way that the NVAC Working Group words a possible solution – vaccinated vs unvaccinated via parental choice – sounds pretty much like the Generation Rescue phone survey. And we know how that ended up.
Recent Comments