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zoom RSS 自閉症児の増加はワクチン添加物と関連しない

<<   作成日時 : 2008/01/14 23:45   >>

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 カリフォルニアでは、防腐剤として添加された水銀含有のワクチン中止後も自閉症児の増加がみられる。自閉症とワクチンに含まれる水銀との関連性はないものと結論される。
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Study Finds Vaccine Preservative Is Not Linked to Risks of Autism
http://www.nytimes.com/2008/01/08/health/08autism.html?_r=1&oref=slogin
By THE ASSOCIATED PRESS
Published: January 8, 2008

LOS ANGELES (AP) ― Autism cases in California continued to climb even after a mercury-based vaccine preservative that some people blame for the neurological disorder was removed from routine childhood shots, a study has found.

Researchers from the State Public Health Department found that the autism rate in children rose continuously in the study period from 1995 to 2007. The preservative, thimerosal, has not been used in childhood vaccines since 2001, except for some flu shots.

Doctors said that the latest study added to the evidence against a link between thimerosal exposure and the risk of autism and that it should reassure parents that vaccinations do not cause autism. If there was a risk, the doctors said, autism rates should have dropped from 2004 to 2007.

Dr. Daniel Geschwind, a neurologist at the David Geffen School of Medicine at the University of California, Los Angeles, said the focus should be on exploring possible causes of autism, including genetic links.

“Something else must be at play,” said Dr. Geschwind, who had no connection with the study. “And we need to know what that is if we’re really serious about preventing autism.”

The results of the study are in the January issue of The Archives of General Psychiatry. The study did not explore why autism cases increased.

Officials say one in 150 American children have autism, higher than other estimates. Researchers say it is unclear whether the increase stems from changes in classifying autism or whether the increase is actual.
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Continuing Increases in Autism Reported to California's Developmental Services System
Mercury in Retrograde
Robert Schechter, MD, MSc; Judith K. Grether, PhD
Arch Gen Psychiatry. 2008;65(1):19-24.

画像ABSTRACT
Context Previous analyses of autism client data reported to the California Department of Developmental Services (DDS) have been interpreted as supporting the hypothesis that autism is caused by exposure to the preservative thimerosal, which contains ethylmercury. The exclusion of thimerosal from childhood vaccines in the United States was accelerated from 1999 to 2001. The Immunization Safety Review Committee of the Institute of Medicine has recommended surveillance of trends in autism as exposure to thimerosal during early childhood has decreased.

Objective To determine whether trends in DDS autism client data support the hypothesis that thimerosal exposure is a primary cause of autism.

Design, Setting, and Patients Study of time trends in the prevalence by age and birth cohort of children with autism who were active status clients of the DDS from January 1, 1995, through March 31, 2007.

Main Outcome Measure Prevalence of autism among children with active status in the DDS.

Results The estimated prevalence of autism for children at each year of age from 3 to 12 years increased throughout the study period. The estimated prevalence of DDS clients aged 3 to 5 years with autism increased for each quarter from January 1995 through March 2007. Since 2004, the absolute increase and the rate of increase in DDS clients aged 3 to 5 years with autism were higher than those in DDS clients of the same ages with any eligible condition including autism.

Conclusions The DDS data do not show any recent decrease in autism in California despite the exclusion of more than trace levels of thimerosal from nearly all childhood vaccines. The DDS data do not support the hypothesis that exposure to thimerosal during childhood is a primary cause of autism.

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自閉症児の増加はワクチン添加物と関連しない 医師の一分/BIGLOBEウェブリブログ
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