The research is somewhat fragmented. The majority of the science on neurotoxicity has been conducted in children because their growing brains are more vulnerable than those of adults. Most of the existing adult science looks at other health issues and tends to focus on long-term effects of low-level exposure to lead in the workplace. We know the effects become more profound as your blood-lead concentration increases, but in Flint, relatively few adults were ever tested for exposure, says Michael Kosnett, a professor of pharmacology and toxicology at the University of Colorado School of Medicine.
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