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Posted 18 Dec 2015 by Drugs.com
FRIDAY, Dec. 18, 2015 – Exposure to toxic chemicals while in the womb or in early life may weaken a baby's immune system response to the tuberculosis (TB) vaccine, researchers say. The study focused on two common toxins: PCBs, an industrial chemical; and DDT, used in pesticides. These so-called "persistent" pollutants are not easily broken down and remain a health threat years after being banned. PCBs were banned in the United States in 1979. DDT is banned in the United States, but is still used in some countries to control malaria-carrying mosquitoes, the study authors, from the University of Rochester in New York, said in a university news release. The researchers analyzed blood samples and immune responses from 516 pairs of mothers and infants in an area of Slovakia heavily contaminated with environmental toxins. Each baby received the tuberculosis vaccine in their first four days ... Read more
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