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Parents of children with autism said this week's revelation that at least one pharmaceutical company knew of the high levels of mercury in vaccinations years before disclosing it further supports their suspicions that the poison causes neurodevelopmental disorders.
Many parents have long been suspicious of the effects of vaccines containing thimerosal, a compound used to guard against contamination and which is almost 50 percent ethyl mercury. Until recently, the neurotoxin was used in many pediatric vaccines; public health officials first acknowledged the high levels of mercury in those shots in 1999.