As I alluded to in my last post, there’s been a glut of publications regarding autism and thiomersal/mercury of late.
First (as they reached me) was Jim Adams latest nothing paper. Do’C has the full story but the salient points to take home about this study is that:
There’s plenty of other silliness in this paper, including citations of Geier and Geier, and a tiny sample size that produced data that I think most people would look at and ask, “so what?â€. But the bottom line is this – is the authors’ conclusion supported by the data?….Neither mercury body burden nor excretion was demonstrated to be related to mercury levels in teeth, autistic children were not demonstrated to be “poor mercury excretorsâ€, and high usage of oral antibiotics was not demonstrated to impair mercury excretion in humans.
An interesting side note – this paper was published in a journal that recently published the latest Geier twaddle. Seems like the editor likes a bit of woo. As Do’C uncovered from the editor of this journal:
“According to the literature there is a relationship between vaccines and autism.”
Which is weird as numerous literature reviews have shown the exact opposite. Either the editor is a very credulous sort or…well, no, he’s just a bloody idiot.
Now we turn to a study called ‘Lack of association between Rh status, Rh immune globulin in pregnancy and autism‘.
This study looked at:
whether mothers of children with autism are more likely to be Rh negative (Rh-) or to have received RhIg preserved with thimerosal, which is 49.6% ethyl mercury
So – do kids with autism come from a population who’s mothers had received RhIg? Thats what this study asked. The answer was:
Rh- status is no higher in mothers of children with autism than in the general population, exposure to antepartum RhIg, preserved with thimerosal is no higher for children with autism and pregnancies are no more likely to be Rh incompatible. This was also true for autism subgroups defined by behavioral phenotype, gender, IQ, regressive onset, head circumference, dysmorphology, birth status, essential, or complex phenotype
Of course, this answer didn’t suit SafeMinds Mark Blaxill. He released his usual pontificating crapola:
The study was funded by Johnson & Johnson, the largest manufacturer of RhIg products and the defendant in several lawsuits alleging a link between autism and mercury in RhIg. In an earlier 2005 poster presentation, the study authors acknowledged that the research was “supported by Johnson & Johnson Pharmaceutical Research,” but the University of Missouri press release omits mention of this conflict of interest.
Last I heard Marky, scientists don’t write press releases. Marketing depts do. As you yourself admit, when the poster version of this paper was presented, the *authors* (as oppose to the marketing dept) *did* acknowledge their funding. So, whats your point? That Missouri University Marketing dept. screwed up? Talk about a strawman.
And lets top beating around the bush here. If defendants in lawsuits can’t fund science, then why is it OK for prosecutors to fund science? If you want to go down the ‘conflict of interest’ route than that means Geier, Adams and a whole host of others who have already profited to the tune of several thousand pounds and who stand to profit even more should be equally discounted.
The press release headline falsely claims that the “Study Finds No Link Between Autism and Thimerosal in Vaccines.” The study is about Rh immune globulin, and immune globulins are not vaccines. “The headline deceives the public,” noted Mark Blaxill, director of SafeMinds. “It says an autism-mercury in vaccines link has been disproved when the research did not do so.”
Once again Marky – try and assimilate the difference between a press release and the actual paper. The paper’s abstract doesn’t mention the word vaccine until the very last sentence – and then only to point out thiomersal is also in vaccines. None of Blaxill’s point address _science_ at all. They try and make a strawman out of a press release. A press release the scientists who wrote this _paper_ no doubt had no control over whatsoever.
Blaxill then goes on to say that SafeMinds found numerous errors with the poster presentation but neglects to state what they were. Guess we should just trust them.
And if we want further verification of the non-link between the Rhogam issue then we should look no further than ‘Rh and ABO Maternal-Fetal Incompatibility and Risk of Autism‘ published in 2006 (Zandi et al) which states:
Moreover, some have speculated that RhD immune globulin injections may itself increase autism risk due to increased prenatal
exposure to thimerosal [Blaxill et al., 2004], an ethyl mercury containing vaccine preservative used in some formulations. The current findings do not support the hypothesis that the risk of autism is increased due to existing potential complications of maternal-fetal incompatibility with or without prophylaxis, nor do they appear to be consistent with the suggestion that the use of prophylaxis itself may increase risk.
Of course, SafeMinds don’t mention this as it clearly demonstrates the quackery that Blaxill wallows in.
And by the by, isn’t it incredible that for a group of people who are now claiming it never was _just_ about the thiomersal (See Brad Handley’s amazing feat of flip-flopping for details) they are certainly clinging on like grim death to that fallacy?
And hey – what about all those ‘other things’ (usually in vaccines) that ’cause autism’? Well, another recent study looked at just how well the practice of provoking reactions using a chelator (DMSA in this case) actually worked. ‘24-hour provoked urine excretion test for heavy metals in children with autism and typically developing controls, a pilot study.‘ looked at:
…Seventeen children with autism and five typically developing children were enrolled in a pilot study to test for chelatable body burden of Arsenic (As), Cadmium (Cd), Lead (Pb), and Mercury (Hg)
And the results?
Fifteen autistic children and four typically developing children completed the study. Three autistic subjects excreted one metal in greater quantity during the provoked excretion than baseline. Two of these were very close to the limit of detection. In the third case, the provoked excretion of mercury was between the upper limit of normal and lower limit of the potentially toxic reference range.
In other words – none of the kids, autistic or otherwise had clear progression into the toxic range of body burden of any metal. Three autistic kids had slightly higher results when DMSA was used to provoke than when it wasn’t. However, again, none was high enough to get into the toxic range. And as for the third autistic child, the team did one more thing:
Fish was removed from this child’s diet for greater than one month, and the provoked excretion test repeated. The repeat excretion of mercury was within the normal range
.
Hilarious. The conclusion:
In the absence a proven novel mode of heavy metal toxicity, the proportion of autistic participants in this study whose DMSA provoked excretion results demonstrate an excess chelatable body burden of As, Cd, Pb, or Hg is zero.
Zero. None. Nada. Zip. Bugger all.
Lets hope that this pilot study is expanded upon and replicated.
And talking of chelation studies, Diva has some hot gossip regarding the fate of the NIMH chealtion study:
Dr. Swedo was running a chelation study at the NIMH until recently. The word, coming from a reliable source, is that the study has been shut down. This is good news, because it was a horrible study with horrible ethical problems and no legitimate scientific underpinnings. The study still appears on the clinicaltrials.gov page, but the link to the NIMH page is dead. So maybe the study rests in peace, too.
Last, but far from least, a fascinating theoretical study called ‘The Autism Epidemic: Fact or Artifact?’ has looked at the epidemic wankfest:
Using a prediction analysis, we calculate how broadening diagnostic criteria, younger age at diagnosis, and improved efficiency of case ascertainment could produce temporal trends in the incidence and prevalence of AD.
and what did they come up with?
Time trend studies report an increase as large as 11.0-fold over a 13-year period for AD. Conservative changes in the three methodological factors produced increases in the frequency of AD ranging from 2.1- to 28.8-fold
Interesting stuff. Hardly conclusive, but certainly food for thought. I can’t help but note that it comes from researchers at Columbia University. I wonder what that other CU employee Mady ‘they chewed through my skull’ Horning thinks about this study?
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