sadly since the vast majority of the population takes a vaccine it becomes impossible to statistically link it to certain side affects.
for example if 50% of the population took a vaccine and they had dramatically more cases of autism than the other 50% then you could say that there is a clear link between autism and the vacinations.
but when there is no decent volume of people for a comparison you could link the vaccinations with almost anything.
for example you could argue that there is a link between vaccinations and psychosis as most of the people with psycosis had vaccinations then some people could say there is a clear link.
i Think that genetics plays a big part in the development of autism as has been shown in twin studies:
Quote:
One study showed that the likelihood that the identical twin of an autistic child also would be autistic was 82 percent, whereas the equivalent rate for fraternal twins was only 10 percent.
With sophisticated statistical techniques and numerous twin studies, behavioral geneticists now believe that as much as 90 percent of the behavioral phenotype of autism is related to inherited genes.
Such a high genetic contribution appears to be the exception rather than the rule when considering complex behaviors. This is probably because a relatively small number of genes may be involved in autism (but certainly more than one), whereas other behaviors may be influenced by many genes.
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