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Okay, before you shoot the messenger, let me clarify that. There is no "known" link between vaccines and autism. However, there is also no "known" cause of autism. Millions of children get the MMR vaccine every year, and most of them never develop autism. Even without a scientific study, it seems easy to suggest that vaccines can not be solely responsible for autism. But that doesn't mean there is no link between vaccines and autism, just that there is no proof of a link.
I'm not saying there is (or is not) a link between vaccines and autism. I'm not on one side or the other of this argument. But, I do wonder how this most recent study proves that vaccines are not responsible for autism? I'm not sure it really does.
The problem I have with this study is that it says there is no link between certain vaccines and/or ingredients in vaccines to three specific hypotheses of the cause of autism.
From Covering Health...
The review looked at three common theories about how vaccines are linked to autism:
1. the combination measles-mumps-rubella vaccine causes autism by damaging the intestinal lining, which allows the entrance of encephalopathic proteins
2. thimerosal, an ethylmercury-containing preservative in some vaccines, is toxic to the central nervous system
3. the simultaneous administration of multiple vaccines overwhelms or weakens the immune system
Even if this study is correct, as long as the actual cause of autism is unknown, a link between vaccines (or anything else for that matter) can not be ruled out. I want to emphasize the word link. It's clear that vaccines do not cause autism. Considering the majority of children are receiving these vaccines, if they were the only cause of autism it would probably be affecting an even greater percentage of children. However, most medical conditions (such as heart disease, cancer, diabetes, even the common cold) can be linked to one thing or another, but not everyone exposed to a specific cause of a disease will become affected by the disease.
So rather than argue the merits of this study, let me address a more general aspect of the question. Could there be more than one cause of autism?
For example:
- Smoking causes lung cancer. But most people who smoke will not develop lung cancer (if they did there would be no one left to buy cigarettes). One of my very first patients as a nurse was a woman dying of lung cancer, and she never smoked a day in her life. Her husband was the smoker and he was 100% healthy. The fact that all smokers don't come down with lung cancer doesn't mean smoking isn't the cause...just that other factors also play a large role.
- Diabetes is associated with being overweight. But not every overweight person will become diabetic.
- Eating a high fat diet can lead to heart disease. But many people have been eating fast food for a large chunk of their life and have no signs of heart disease.
It's really a matter of...Does the benefit outweigh the risk? In the case of the MMR vaccine, I do think the benefits outweigh the risks (many other vaccines I'm not so sure about). But I still believe parents should be able to to say no if they feel it is best for their child. Personally, I think if the medical community would just accept that many moms have concerns about the MMR vaccine, they could make more options and choices available. Just telling moms they are wrong isn't as helpful as making them feel more comfortable with their decision to vaccinate. And making every vaccine that comes down the pike "mandatory" doesn't help matters much either.
From Silicon Valley Moms Blog...
A month ago, U.C. Davis' M.I.N.D. Institute reported on a study indicating that California's rise of autism cases cannot be based on genetics or new diagnostic techniques alone. I've felt this way for quite a long time, that there are both genetic and environmental factors in autism, with many causes, many cures.
I had the opportunity to hear one of the M.I.N.D. Institute researchers a few weeks ago. I learned more about the longitudinal studies in progress such as CHARGE: "CHildhood Autism Risks from Genetics and the Environment" and MARBLES: Markers of Autism Risk in Babies: Learning Early Signs.
It was a















