Continuous use of childhood medications and vaccines laden with mercury are posing greatest health hazard all over the world. The issue of thimerosal-containing vaccines as a possible cause of autistic spectrum disorders (ASD) and neuro-developmental disorders (NDDs) has been a controversial topic since 1999. To assess the quality of evidence assessing a potential association between thimerosal-containing vaccines and autism and evaluate whether that evidence suggests accepting or rejecting the hypothesis, it is pertinent to evaluate the relevant studies (Parker et al, 2004).
There has been growing clinical and scientific claim that most children with autism suffer from mercury/metal toxicity. Furthermore, there have been many reports from physicians and parents that removal of mercury and other toxic metals can be very
Thimerosal is ethylmercury, a documented dangerous neurotoxin, used as an inexpensive preservative in vaccines (http://autismboulder.org). Thimerosal, a preservative added to many vaccines, has become a major source of mercury in children who, within their first two years, may have received a quantity of mercury that exceeds safety guidelines. A review of medical literature and US government data suggests that: (i) many cases of idiopathic autism are induced by early mercury exposure from thimerosal; (ii) this type of autism represents an unrecognized mercurial syndrome; and (iii) genetic and non-genetic factors establish a predisposition whereby thimerosal's adverse effects occur only in some children (Bernard et al. 2001).
There is extensive evidence that many children with autism suffer from mercury toxicity. Briefly, the evidence shows that children with autism have low levels of glutathione and cysteine (the pre-cursor to glutathione), which is the major pathway for removal of toxic metals like mercury. The children also often had excessive use of oral antibiotics, which greatly inhibits excretion of mercury. The symptoms of autism are consistent with that of mercury toxicity (Autism Research Institute, 2005).
In 2003 a three year investigation of mercury in vaccines concluded that it was hazardous and recommended research into mercury as a contributing factor for neurodevelopmental disorders such as Autism, ADD/ADHD, Speech Delay, Alzheimer's and Gulf War Syndrome be conducted. Recommended research remains incomplete. The Centers for Disease Control (CDC) announced the continuing investigation into mercury in vaccines and autism (Autismboulder.org. 2005).
Geier and Geier ( JP&S, 2003) pointed out that introduction of thimerosal in vaccines is directly associated with growing number of autism cases in children and complete removal of thimerosal from all childhood vaccines is recommended for eliminating any risk the child may be exposed to . Their research study confirms that there was a two- to six-fold increased incidence of neurodevelopment disorders following an additional 75-100 microgram dosage of mercury from thimerosal-containing vaccines