The conspiracy theory that vaccines, specifically the mercury-based compound thimerosal used until recently in the MMR vaccine, might be linked to autism has been around for years. Yet scientific study of the issue has consistently proved that this is not true. When a lot of children are vaccinated and some children develop autism, there is bound to be some overlap, but that does not prove cause and effect. Some people who carve pumpkins on Halloween have heart attacks, but that does mean pumpkin carving is a cardiac risk factor.
But the vaccine/autism issue has been revisited recently because of one girl with a mitochondrial disorder in whom vaccination and autism may, indeed, be linked.
This association deserves investigation. Perhaps there are rare instances in which vaccines should not be administered, but this does not negate the many studies that have confirmed, over and over, no cause/effect relationship between vaccination and autism.
Is it possible that something can be safe for the population, but dangerous for the rare individual? Of course! Peanuts are a perfect example. For most of us, peanuts are a delicious treat. For those with anaphylactic peanut allergy, they are a lethal threat. This small threat doesn't mean peanuts are toxic or should be banned, just that some people should avoid them.
I believe the same will prove true of childhood vaccination. For most of our children, the benefit of vaccination is high and the risk next to nil. Experts will identify the small percentage of cases where there is in fact a link, just as we identify and try to protect children with peanut allergy.
The bottom line is, parents should not avoid childhood vaccines anymore than they should ban peanut butter, chocolate, or playing outside at recess.
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