A mercury-containing vaccine preservative is not associated with problems in speech, intelligence, memory, coordination, attention, or other measures of childhood development, a large new study finds.
Child-health experts say that the results should allay concerns that thimerosal, a preservative first added to vaccines in the 1930s, affects children’s brains.
“The study was enough to convince me that this small amount of mercury … was not harmful to the children,” says Michael Goldstein, vice president of the St.
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