Many vaccines contain mercury in the form of thimerosal. Thimerosal was patented in 1928, and has been used ever since, despite it being tested on humans only once, in 1929…a test in which all 22 subjects died within 2 days of receiving the thimerosal. Mercury is a known toxin and neurotoxin, with no safe amount for a human. It can kill when applied externally. With vaccines, it is injected internally. Claims that mercury has been removed from vaccines given to children are false.