David is obviously a reader of this blog or Autism Vox or Respectful Insolence as these are (so far as I know) the three blogs that commented on his claim that thimerosal was no longer the ‘smoking gun’ for autism causation. Here’s the quote from the New Jersey Star Ledger:
David Kirby, a journalist and author of “Evidence of Harm: Mercury in Vaccines and the Autism Epidemic: A Medical Controversy,” said he believed that thimerosal, which still exists in trace amounts in some childhood vaccines, was no longer the “smoking gun.” Several national studies have found no connection, and a California study found that, even after thimerosal was removed from vaccines, diagnoses of autism continued to rise.
Now that’s a pretty unequivocal statement. Even so, David felt the need to clarify on Age of Autism yesterday:
The term “smoking gun” comes from Sherlock Holmes…..[]….To this writer’s mind…….the term means the “one and only cause,”.
I do not believe that thimerosal is the one and only cause of autism.
Now I’m confused. In the quote from the New Jersey Star Ledger David says thimerosal is no longer the cause of autism. In his own quote on AoA he says it is. Here is the quote that uses the words ‘smoking gun’:
The triggers, as I mentioned, might include, unfortunately, everything, and when I wrote my book I was hopeful that maybe thimerosal was the smoking gun. And if we just got mercury out of vaccines, autism would rapidly reduce. And we haven’t seen that happen yet. But I did say if that does not happen then that’s bad news; now we’re back to square one. It would have been so much nicer, and easier, and cleaner to say, gosh, it was the mercury in the vaccines and now we can take it out and the case is closed. That didn’t happen, and we need to look at everything. And as I said, not only the individual vaccine ingredients, but also the cumulative effects of so many vaccines at once.
So, this then as people said to me, is not David saying ‘its not thiomersal’, its David saying its not just thimerosal.
I’m kind of saddened by this. As David himself says:
There has been so much debate over ‘What is THE cause?’ And for a long time in this country, we were fixated on thimerosal, the vaccine preservative, and I share some of the blame for that because my book focused mostly on thimerosal.
Fixated is the right word. Some of us over and over and over were constantly telling people it couldn’t possibly – based on the available data – be thimerosal. And yet this stopped no-one from saying it was. More importantly it stopped no one from chelating autistic kids needlessly for ‘mercury poisoning’ that didn’t actually exist.
David now officially joins with Jenny McCarthy and the new side of autism/vaccines. Its everything. Individual vaccines ingredients and the cumulative effects of so many vaccines at once. My question is why? What we have here is an instance where a hypotheses was tested and failed to be accurate. It took 10 years for people who believe David to get that message. Many still haven’t.
David also claims that his infamous claim about CDDS data in 2005 (that if the thiomersal hypothesis was correct CDDS rates would fall – they didn’t) failed to take into account key confounders –
1) Falling age of diagnosis
2) Thiomersal in the flu shot
3) Immigration
4) Rising levels of background mercury
With all due respect to David these are pretty shoddy. David asks if the caseload could’ve increased between 1995-96 due to recent falling age of diagnosis and aggressive early intervention. I’m not sure that 95-96 could really be considered recent.
As discussed by Do’C on Autism Street, the whole ‘mercury in flu shots’ thing is rather misleading:
…better than 90% of the 5 year olds in the relevant data set were not even vaccinated. Does the increase in flu shot uptake in this age group that occurred after 2003 even matter with respect to the California data? It doesn’t seem likely given that about 80% of kids in the relevant age group are not even vaccinated during the next couple of years. But aside from that, the ones who were vaccinated were decreasingly likely to receive a thimerosal containing flu shot at all.
I’m not sure what to make of the Immigration thing. It makes me feel a bit uncomfortable – its easy to blame ‘the outsiders’ but without any actual science (and I’m not of the opinion that running CDDS data through Excel is science, sorry) to back those beliefs up, it feels like an easy ‘out’.
This rising levels of background mercury thing puzzles me. It may well be happening. David didn’t source the three studies (I imagine one is the Palmer thing) but I don’t see what background mercury has to do with thiomersal? Maybe I’m missing the obvious here.
David went on to describe what mercury can do:
constriction of visual fields, impaired hearing, emotional disturbances, spastic movements, incontinence, groaning, shouting, dizziness, nausea, vomiting, diarrhea and constipation,” (HERE) (otherwise known as every afternoon at the Redwood house, circa 1998 in my book)
That may well be ‘every afternoon in the Redwood house’ but its never been any time of the day in my house. None, I repeat, none of the symptoms David lists form part of the DSM (IV). Whatever it was causing those symptoms every afternoon in the Redwood household, it had nothing to do with autism.
David closes by referring to a study published early this year. He says:
So, despite all the cries of innocence among mercury supporters, the California study authors insist that this trend has not been confirmed.
Not quite. Here’s the quote from the Medical News Today article:
They also cautioned that the evaluation of the trends needs to continue in order to confirm their findings for the children born more recently.
What they’re saying is that their conclusion for the data they’ve looked at is:
The DDS data do not show any recent decrease in autism in California despite the exclusion of more than trace levels of thimerosal from nearly all childhood vaccines. The DDS data do not support the hypothesis that exposure to thimerosal during childhood is a primary cause of autism.
but – quite reasonably – for children they haven’t looked at, they can’t speak for.
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