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For example, a swine flu vaccine in the 1970s caused the sometimes paralyzing Guillain-Barre syndrome in 1 out of 100,000 cases, he said.
But no such correlations have been found for autism, which affects about 1 out of 150 children, he said.
"It should be easily picked up," he said. "It hasn't been, and the reason it hasn't been is because vaccines do not cause autism."
Offit said mercury is part of the natural environment. There's no escaping it and, in fact, children will get more mercury from breast milk than they get from a vaccine. Yet, he's frustrated when he hears lawmakers speak of having zero tolerance for mercury.
"On this planet you can't have zero tolerance for mercury," he said. "You would have to move to another planet."
Autism is characterized by impaired social interaction. Those affected often have trouble communicating, and they exhibit unusual or severely limited activities and interests. Meanwhile, classic symptoms of mercury poisoning include anxiety, fatigue and abnormal irritation, as well as cognitive and motor dysfunction.
The report from the Institute of Medicine pointed to five large studies, here and abroad, that tracked thousands of children since 2001 and found no association between autism and vaccines containing the preservative thimerosal.
Members of the National Autism Association see drug manufacturers and the federal government as working too closely together to the point that the federal government is working to protect the industry from liability. The association says its mission is to raise awareness of environmental toxins as causing neurological damage that often results in an autism or related diagnosis.
Bono, a member of the association, said he doesn't believe his son was intentionally poisoned.
"I just want someone to step up and say, 'You're right, this did happen,'" he said.
During the hearing, lawyers for the parents were expected to present their expert testimony during the first week. Then lawyers representing the federal government were expected to present their case. The hearing was to be open to the public.
Officials planned to post transcripts on the court's online site about 24 hours after each day's proceedings.
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[Text copied from Associated Press file]
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