If it’s a vaccine, or similar to a vaccine, especially if it contains thimerosal you gotta figure someone, somewhere has blamed it as a cause of autism. Such is the case of anti-D immune globulins, like RhoGaM. RH-negative mothers are given these shots while pregnant to protect their RH-positive babies.
If you are thinking like I was at first, “RhoGaM…where I have heard this recently?”, probably the most famous case involving RhoGaM is that of the Sykes family in what became Sykes v. Bayer. This was blogged extensively at neurodiversity.com, including the recent dismissal of the suit. On the way, the Plaintiffs subpoenaed Ms. Seidel (the more than a mere mother who runs neurodiversity.com). Said subpoena was quashed, and Mr. Shoemaker, the attorney who subpoenaed Ms. Seidel was sanctioned for what was deemed a misuse of his powers as an officer of the court.
But, I digress…Back to RhoGaM and similar products.
Earlier this month, a study by Lisa Croen (and other people familiar in the epidemiology of autism) was published:
Maternal Rh D status, anti-D immune globulin exposure during pregnancy, and risk of autism spectrum disorders.
Lisa A. Croen, PhD; Marilyn Matevia, MA; Cathleen K. Yoshida, MS; Judith K. Grether, PhD
It’s worth reading, and, I would bet money, is soon to be attacked. Why? Take a look at the last line of the abstract:
“These data support previous findings that prenatal exposure to thimerosal-containing anti-D immune globulins does not increase the risk of autism. that prenatal exposure to thimerosal-containing anti-D immune globulins does not increase the risk of autism.”
One could speculate whether the parties in Sykes v. Bayer were aware that this paper was in press, and whether that had anything to do with the dismissal. Without any more information, it would be just that: speculation.
Something that rises above speculation, but is below the level of a conclusion of the paper is this question: does this mean that this level of thimerosal exposure to pregnant women (at least at the times similar to that of RhoGaM injections) is off the hook in general? Or, to put it more simply, does this tell us that thimerosal containing flu shots given to pregnant woman are likely not a contributor to autism risk?
This is an interesting question in some circles. In the shifting sands of the desert that is the thimerosal-caused-autism science, the thimerosal containing flu shot is gaining prominence. Ignore the fact that a minority of pregnant women get the flu shot. Somehow, these flu shots are supposed to be taking up the slack left behind by the phase out of thimerosal from the pediatric schedule. (I can hear people now, “oooh, he’s perpetuating the myth that thimersosal is gone. There are trace amounts left. Trace amounts!” Another of the sand-dunes of the desert.)
OK, for the ultra involved, I bet some people fixated on the statement: “These data support previous findings…”. Some people will be angry with the thought that Croen et al. seem to be ignorant of “Neurodevelopmental disorders, maternal Rh-negativity, and Rho(D) immune globulins: a multi-center assessment.” By Geier, Mumper, Gladfelter, Coleman and Geier. Yep, our good friends the Geiers. I believe that is also our new friend, Dr. Mumper as well.
But, rest assured, Croen and company are aware of Dr. Geier’s team and included their work in their analysis.
Similarly, Geier and Geier found that the frequency of maternal Rh-negative status among 53 consecutive non-Jewish Caucasian patients with ASD referred to their genetic clinic was significantly higher than the frequency among 926 non-Jewish Caucasian pregnant women who presented at their clinic for prenatal genetic care (28.3% vs 14.4%, P ” .01), and all ASD patients with Rh-negative mothers received RhIg during pregnancy. Given the authors’ belief that thimerosal-containing vaccines cause autism, it is likely that the ASD patients who seek out their clinical services are skewed toward higher perceived mercury exposure. For that reason, these study findings may be biased and should be viewed with caution.
And, yes, they also note the Holmes “baby haircut“study as well. But that study has been through the wringer so many times, it’s best to move along.
As they indicate, Croen et al. are not the first to look for and fail to find evidence of a link between Rh status and immune globulins. Miles and Takahashi’s 2007 paper, Lack of association between Rh status, Rh immune globulin in pregnancy and autism found, well, a lack of association.
Of course this isn’t going to be the end of the discussion. The Miles and Takahashi study was met in short order by a comment by Bernard, Blaxill and Redwood. I’d bet the cash in my wallet that a response to the Croen et al. study is in the works.
And, unfortunately, that is the problem we as a community have to deal with. As noted (with some sadness, I am sure) in the Omnibus testimony of Dr. Mumper, the question of thimerosal and autism is a closed book to the scientific community. There are a few studies still ongoing, but indications are that they will also show no effect.
It will be hard enough to keep the interest level high amongst legislators as the science quashes the guilt factor of vaccine induce autism. It will be even more difficult if we are perceived to be clinging to the failed theories and ignoring good science.
Autism isn’t “a novel form of mercury poisoning“. Not from vaccines, not from immune globulins, not from plumes of mercury from China. Let’s stop moving goalposts and patting ourselves on the back for being flexible. Instead, let’s accept that falsifiable hypotheses have had their chance and been falsified. That’s learning.



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