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In reply to the discussion: Whooping Cough Back With a Vengeance in California [View all]pnwmom
(110,270 posts)"However, depending on the vaccine formulations used and the weight of the infant, some infants could have been exposed to cumulative levels of mercury during the first six months of life that exceeded EPA recommended guidelines for safe intake of methyl mercury."
SOME INFANTS could have been exposed to excessive amounts of mercury. It isn't necessary that 100% would have been. The fact that some infants, depending on the "vaccine formulations" and the "weight of the infant" could have been exposed to too much mercury is why the Public Health Service changed its recommendation.
In other words, premature and smaller babies were at greater risk of getting too much mercury exposure; and to their credit, this wasn't an acceptable risk for the Public Health Service or for the American Academy of Pediatrics.