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Evidence continues to mount that points to vaccines as the "mystery" trigger behind SIDS, or sudden infant death syndrome. A recent study published in the journal Acta Neuropathologica, as well as extensive data on vaccination rates and the timing of SIDS cases, suggests that vaccines may be inhibiting the proper development of the hippocampus in some babies, resulting in the various breathing and cardiac failures that lead to SIDS.
Researchers from Boston Children's Hospital and Harvard Medical School inadvertently discovered this after observing that nearly half of all infants in a group who died from SIDS had a unique abnormality in their hippocampus that was not present in infants who died from other other known causes. Based on their observations, it is now believed that this abnormality upsets the brain's ability to regulate breathing and heart rate patterns during sleep, which is when SIDS typically occurs.
Though it is widely known that the hippocampus regulates brain-specific functions like memory, learning and spatial orientation, this central region of the brain also regulates breathing and cardiac function. When a structure within the hippocampus known as the dentate gyrus contains double layers of nerve cells instead of the usual single layers, the resulting abnormality, known as focal granule cell bilamination, can lead to sudden death for reasons that may not be initially apparent.
"The pattern of abnormal changes in the dentate gyrus suggests to us there was a problem in its development at some point in late fetal life or in the months right after birth," explained Dr. Hannah C. Kinney, M.D., lead author of the study. "We didn't see any signs of injury to the brain by low oxygen levels in the tissue we examined, such as scarring and loss of nerve cells."
A press release for the study, which was funded by the National Institutes of Health (NIH), is available here:
More vaccines means higher infant mortality, study finds
How this relates to vaccines was explained in a 2011 study published in the journal Human & Experimental Toxicology. Since SIDS is the leading cause of death among babies between the ages of one month and one year, something common but most likely overlooked during its victims' normal developmental period is clearly to blame, and this common thing appears to be routine childhood vaccinations.
A team of independent researchers looked at the infant mortality rate (IMR) around the world and observed a direct relationship between the number of vaccines given and the number of infant deaths. In other words, countries that administer the most vaccines to children during the first year of life were found to have a higher IMR, while countries that are more careful with vaccines were found to have a lower IMR.
"Linear regression analysis of unweighted mean IMRs showed a high statistically significant correlation between increasing number of vaccine doses and increasing infant mortality rates," explains an abstract from the study, available here:
Brain abnormalities linked to SIDS develop primarily when children are vaccinated for hepatitis B
Interestingly enough, the SIDS study also revealed that the hippocampus abnormalities associated with SIDS tend to emerge right around the time that babies are vaccinated for hepatitis B. As you may recall, the hepatitis B vaccine is associated with causing seizures and epilepsy in some children, which is often associated with hippocampus abnormalities.
This suggests that, at least in some cases, children who are vaccinated for hepatitis B immediately after birth in accordance with U.S. Centers for Disease Control and Prevention (CDC) guidelines experience developmental damage to their hippocampus, which later leads to sudden death.
Sources for this article include: