Vaccines are highly controversial, and much of the debate rightly surrounds their connection to autism and their inclusion of mercury and other heavy metals. However, there is another aspect of vaccines that doesn't get as much attention even though it could have grave repercussions for life on this planet: Retrovirus contamination.

A type of virus whose genes are encoded into RNA rather than DNA, retroviruses function differently than other types of viruses but can be just as devastating. Human retroviruses include HIV and human T-cell lymphotropic virus 1, which has been associated with some leukemias and lymphomas.

All animals have some retroviruses integrated into their genomes, with as much as 15 percent of the human genome believed to be made up of ERV human retroviruses. They contribute to diseases such as cancer, autoimmune diseases, and neuroimmune diseases.