Chemicals Found in Manufacturing Affect Some Childhood Vaccines

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"Certainly, this study begs to have further testing done on PFCs so, if in fact, subsequent studies demonstrate an impact on the immune system, this product is at least taken out of use going forward," said Dr. Ari Brown, co-author of "Baby 411" and a developmental pediatrician in in Austin, Texas.

This isn't the first study to find potential negative health effects of PFCs. A 2009 study linked exposure to the chemicals to potential delays in getting pregnant for a group of more than 1,200 women.

Lawrence said scientists need a better understanding of just how these chemicals affect humans.

"Often when we think about pollutants and how they affect our health, we think about important and scary diseases like cancer," Lawrence said. "That is very important, but as a society we often tend to overlook more subtle adverse effects, such as how a chemical affects our ability to fight infections."

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