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FRIDAY, Mar 7, (News Locale) - The link between vaccines containing mercury and the development of autism and other neurological problems has been debated for a long time. Although the pros and cons have been argued since the late 1990s, the case of Hannah Polling has brought the perceived link between vaccines and autism under the scanner once again.
Hannah Polling developed symptoms of autism in 2000 just after she was administered nine routine childhood vaccines, which were given in July 2000 under a program for children with disabilities where she participated as a peer.
Hannah's mother Terry Polling said that less than 2 days after receiving these vaccines, Hannah began behaving abnormally and shunned food and had bouts of screaming and fever. Hannah's condition deteriorated and she began to exhibit all symptoms of autism including staring at lights and fans.
In 2002, Hannah's parents filed a suit in vaccine court alleging that vaccines containing mercury had played a pivotal role in causing autism in their daughter. Hannah's father Dr Jon Poling is a neurologist in private practice in Baltimore. He gave up his position at Johns Hopkins University to spend more time with his family.
Cliff Shoemaker, the Pollings' attorney said Hannah's case was being considered as a test case last year, but then the federal government conceded that vaccines may have exacerbated Hannah's symptoms and turned them into full-fledged autism.
"What we are all in favor of is safe vaccines," Shoemaker said. “If there is any question or doubt, then it should not be there."
Autism is a complex developmental disorder that severely impairs a child's ability to communicate and interact with other people. Although the precise cause of autism is unclear, a plethora of theories have been suggested.
Many studies have said that mercury used in vaccines may be the cause of autism. Thimerosal is a preservative in vaccines that contains 49 percent ethyl mercury. Mercury is a known neurotoxin or in other words is a chemical that causes untold harm to the brain, especially a child's developing brain.
Scientists thought that autism might be one such toxic manifestation of mercury in vaccines. In 2002, thimerosal was phased out of childhood immunizations mainly because the Public Health Service and the American Academy of Pediatrics advocated it.
Autism-vaccine links emerged in the late 1990s when the State of California released a report suggesting a 273 percent increase in the number of persons with autism between 1987 and 1998. In 2004, the Institute of Medicine examined data on links between vaccines containing mercury and the incidence of autism and found no evidence linking thimerosal to autism. The Institute of Medicine's panel based its conclusions on five large studies conducted in United States, Denmark, Sweden and Britain in 2001. These studies examined thousands of children, but failed to find any link between autism and thimerosal.
The IOM report said it was an undisputed fact that high doses of mercury did cause substantial neurological damage. However no symptoms resembled that of autism, the report suggested. It added that genetics was the main causative factor as many studies had noted that autism started prenatally.
A review by the Environmental Working Group suggested that autistic children had a biomarker that rendered them susceptible to mercury and heightened their risk of developing the neurological disorder. The report cited a study by Dr. Jill James of the University of Arkansas School of Medicine, which found that children with regressive autism had high levels of oxidative stress, which made it hard for their bodies to get rid of mercury.
The study cited the following factors as well (as available on www.ewg.com) * The indisputable toxicity of mercury to the brain, particularly the developing brain (Limke 2004, Clarkson 2002, Mahaffey 1999). * Peer-reviewed reports showing that autistic children are extremely poor at ridding their bodies of mercury as measured by mercury hair levels (Holmes 2003). * The recent finding that autism-like symptoms are triggered by thimerosal in mice with a predisposition to autoimmunity (Hornig 2004). * The fact that the prevalence of autism in boys is four times that in girls, and that boys have elevated incidence of damage from mercury exposure in epidemiologic studies (Vahter 2002).
The study said that it did not find a credible link between mercury in vaccines and autism, but there was sufficient evident to suggest mercury played some role.
This theory was reinforced by a study in 2006 which showed that autism cases declined when mercury was banned from vaccines. Using data from CDC’s Vaccine Adverse Event Reporting System (VAERS) and the California Department of Developmental Services (CDDS), lead authors David A. Geier, B.A. and Mark R. Geier, M.D., Ph.D found that autism rates hit a high of 800 in May 2003, but dropped to 620 in 2006.
The authors suggested that the 22 percent decline in autism cases was mainly due to the restriction of mercury in vaccines.
The U.S. Centers for Disease Control and Prevention estimates that one in every 150 children has autism and that 560,000 people aged till 21 in the United States have autism.
Experts have tried to dispute the vaccine-autism link by suggesting that children are naturally distressed by shots and that this is the age when autism is first diagnosed leading parents to believe that the vaccines cause it.
Therefore experts like Dr. Julie Gerberding, director of the Centers for Disease Control and Prevention have said that there is still no evidence of vaccines causing autism. "This does not represent anything other than a very specific situation and a very sad situation as far as the family of the affected child," she told reporters.
Nevertheless the sad case of Hannah Polling does give a pointer to the fact that mercury-laced vaccines may trigger autism if not cause the condition.
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