The culture medium for the vaccines that many of us have received over the years includes cells from animals. It’s possible that these cells have harbored animal viruses or retroviruses, which subsequently piggybacked their way, via the vaccines, into humans. Here are some of those vaccines:
Polio vaccine: Monkey kidney tissue
Polio vaccine: Mouse brain
Japanese encephalitis vaccine: Mouse brain
Rabies vaccine: Rhesus fetal lung tissue
Rotovirus vaccine: Monkey kidney tissue
Vaccinia (smallpox) vaccine: Monkey kidney cell
Yellow fever vaccine; flu vaccine; rabies vaccine: chicken embryo
.jpg){kind=small}
