It is a common myth today that the vaccines administered to children no longer contain the toxic additive thimerosal, a mercury-based preservative linked to causing permanent neurological damage. But a recent federal case involving the U.S. Food and Drug Administration (FDA) has revealed that, contrary to this widely-held belief, thimerosal is actually still present in many batch vaccines, including in the annual influenza vaccine that is now administered to children as young as six months old.
Another myth often spread by thimerosal advocates claims that the ethylmercury compounds that compose roughly 50 percent of the preservative are not actually harmful because they are different from the type found in a can of tuna. But a comprehensive review conducted by Dr. Paul G. King has proven otherwise, showing that ethylmercury is first metabolized by the body into toxic methylmercury, which is then metabolized into inorganic mercury.
Both methylmercury and inorganic mercury are listed by the U.S. Environmental Protection Agency (EPA) as toxic substances responsible for causing neurological problems, brain disorders, nervous system illnesses, gastrointestinal problems, kidney failure, respiratory illness, and death (http://www.epa.gov/hg/effects.htm).