Pichichero's group found that for all three age groups, the half-life of ethyl mercury in the blood -- the time it takes for the body to get rid of half the mercury, and then another half, and so on -- was 3.7 days. That's significantly less than the half-life of methyl mercury, the kind found in fish, at 44 days.
"Until recently, that longer half-life was assumed to be the rule for both types of mercury. Now it's obvious that ethyl mercury's short half-life prevents toxic build-up from occurring. It's just gone too fast," Pichichero said.
"If you thought thimerosal was responsible for autism, you would be looking at mercury levels that were far below anything anyone's previously thought as being toxic," Treanor added.
"Though it's reassuring to affirm that these immunizations have always been safe, our findings really have greater implications for world health," Pichichero said. "Replacing the thimerosal in vaccines globally would put these vaccines beyond what the world community could afford for its children." "
The study findings were to be released Monday in the February issue of the journal Pediatrics. But they were released early by the American Academy of Pediatrics, which is requesting that the ABC network cancel the premiere episode of a new show Thursday dealing with the thimerosal-autism controversy.
The new findings also follow a recent report from the California Department of Health that rates of autism continue to climb there even after thimerosal was removed from childhood vaccines.
And they follow a series of studies, including a large-scale U.S. Institute of Medicine review in 2004, that failed to uncover a link between childhood vaccines and autism. The first report of a possible connection appeared in British study in the late 1990s and has since been discredited.
Current estimates by the U.S. National Ins
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