Mercury compounds are used in vaccines as preservatives. The toxicity of mercury has been repeatedly ignored in the area of vaccines by the medical establishment and oversight agencies. Mercury is the second most poisonous element known to mankind (second only to uranium and its derivatives). Brain neurons rapidly and permanently disintegrate in the presence of mercury within 30 minutes of exposure. Mercury is also known to change a body's chromosomes.

The U.S. Government has known about the potential problems of thimerosal (the mercury-containing preservative) for many years. The World Health Organization expressed concerns about it in 1990.

Mercury is a cumulative poison, which means the body has difficulty removing it, and that levels of it in the body will accumulate significantly over time. Large amounts of mercury can accumulate over a lifetime. During a typical day of routine vaccines, infants sometimes receive the same amount of mercury as the absolute maximum set by the World Health Organization for 3 months of adult exposure.

The following was taken from a website affiliated with the National Institutes of Health:

"Symptoms of high exposure to this class of mercury based compounds includes: Aphthous, Stomatitis, Satarrhal gingivitis, nausea, liquid stools, pain, liver disorder, injury to the cardiovascular system and hematopoietic system, deafness and ataxia. Death. Headache, paresthesia of the tongue, lips, fingers and toes, other non-specific dysfunctions, metallic taste, slight gastrointestinal disturbances, excessive flatus and diarrhea may occur. Acute poisoning may cause gastrointestinal irritation and renal failure. Early signs of severe poisoning include fine tremors of extended hands, loss of side vision, slight loss of coordination in the eyes, speech, writing and gait, inability to stand or carry out voluntary movements, occasional muscle atrophy and flexure contractures, generalized myoclonic movements, difficulty understanding ordinary speech, irritability and bad temper progressing to mania, stupor, coma, mental retardation in children, skin irritation, blisters and dermatitis. Other symptoms include chorea, athetosis, tremors, convulsions, pain and numbness in the extremities, nephritis, salivation, loosening of the teeth, blue line on the gums, anxiety, mental depression, insomnia, hallucinations and central nervous system effects. Exposure may also cause irritation of the eyes, mucous membranes and upper respiratory tract."

Complete intolerance to thimerosal is known to develop from previous vaccines. The vaccines stimulate the immune system and cause a sensitization. The neurologic symptoms caused by mercury compounds have a delayed onset after exposure, so few, if any of these symptoms will be noticed at the time of exposure. The mercury of vaccines causes long-term neurological symptoms like learning disabilities and behavior disorders, which did not exist in previous generations.