Navigation Links
Study Casts Doubt on Vaccine-Autism Link
Date:1/7/2008

Research adds to growing body of evidence thats finds no connection between the two

MONDAY, Jan. 7 (HealthDay News) -- Adding to a growing body of evidence that rejects the idea that immunizations boost autism rates, a new study finds no proof that incidences of the disorder dropped after makers of most childhood vaccines stopped using a mercury-based preservative in their products.

Researchers found that autism rates in California continued to rise over the past several years, even though the preservative -- known as thimerosal -- had vanished from almost all vaccines by 2001.

The study makes clear that "thimerosal cannot be the major cause of autism in California," said its lead author, Dr. Robert Schechter, medical officer with the Immunization Branch of the California Department of Public Health.

Another expert called the study limited and said it did not prove that vaccines have no connection to autism.

Still, the new research "adds to the body of existing evidence in which there is no causal connection that demonstrates thimerosal is a primary cause" of autism, said Andy Shih, vice president of scientific affairs for Autism Speaks, an advocacy organization.

Thimerosal, a preservative once used in contact lens solutions, was frequently a component of childhood vaccines until around 2000. Today, it's still used in flu vaccines recommended for infants, but researchers think children are still exposed to much less thimerosal than in the past.

In recent years, some parents have blamed their children's autism on the preservative, which is derived from mercury; others have accused the parents of creating public panic and threatening the health of children by casting a bad light on routine immunizations.

One government study released in 2007 claimed that thimerosal exposure in the first seven months of life didn't appear to affect the brain function of children aged 7 to 10, although there was some evidence -- perhaps the result of chance -- that connected thimerosal to later development of physical tics. Even earlier, an Institute of Medicine report released in 2004 found no evidence supporting a link between thimerosal and autism.

In the new study, published in the January issue of the Archives of General Psychiatry, researchers from the California Department of Public Health examined statistics about children in the state from 1995 through March 2007.

The prevalence of autism among kids aged 3 to 12 grew each year, the researchers discovered after looking at numbers compiled by a state agency that provides services to children with the disorder.

For example, the prevalence among kids born in 1993 was three in 10,000 when they were checked in 1996, compared to 13 per 10,000 among those born in 2003 and checked in 2006.

The highest rate -- 4.5 cases per 1,000 births -- came among 6-year-olds in 2006 who were born in 2000.

The study authors pointed out that autism rates among kids aged 3 to 5 continued to grow for each birth year after 1999, even though thimerosal use dropped.

Shih said the study methods are "robust," adding that the authors appeared to address limitations of earlier studies. However, he said, the research "doesn't address the possibility that there might be a subpopulation who might be particularly vulnerable to a vaccine with thimerosal."

If just 1 percent to 2 percent of children were especially sensitive to the effect of thimerosal, the study wouldn't be able to pick it up, he said.

Schechter agreed, saying it was true that the research didn't address whether thimerosal might cause problems in a small number of cases.

As for a possible link between vaccines and autism, Shih said, "the jury is still out," especially considering that children are exposed to a large number of vaccines before age 2.

And he added, "Some people in the community feel that they might lead to immune problems that could either exacerbate or lead to autism. All this is purely hypothetical, but this is an area where we need to continue to do more research."

More information

To learn more about vaccines, visit the U.S. Centers for Disease Control and Prevention.



SOURCES: Robert Schechter, M.D., medical officer, Immunization Branch, California Department of Public Health, Richmond; Andy Shih, Ph.D., vice president, scientific affairs, Autism Speaks, New York City; January 2008, Archives of General Psychiatry


'/>"/>
Copyright©2008 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Columbia Center for Childrens Environmental Health receives NIEHS grant to study asthma
2. Risk factors for Parkinsons disease under study
3. Patient-Centric Healthcare Study Reveals Key Insights for Pharmaceutical Marketers
4. Circumcision doesnt reduce sexual satisfaction and performance, says study of 4,500 men
5. Pollution shrinks fetus size: Brisbane study finds
6. Researchers use neuroimaging to study ESP
7. Study finds most TV prescription drug ads minimize risk information
8. UGA researchers receive $9 million in grants to study barriers to effective addiction treatment
9. Study Spotlights a Natural Infection Fighter
10. Carnegie Mellon study identifies where thoughts of familiar objects occur inside the human brain
11. American College of Physicians receives grant to study cost of patient-centered medical home
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Study Casts Doubt on Vaccine-Autism Link
(Date:10/13/2017)... ... October 13, 2017 , ... “America On The Brink”: ... “America On The Brink” is the creation of published author, William Nowers. ... As a WWII veteran, he spent thirty years in the Navy. Following ...
(Date:10/12/2017)... ... October 12, 2017 , ... Planet Fitness, one of the largest and ... plans to open a flagship location in Covington, LA at 401 N. U.S. Highway ... store next to Office Depot in the Holiday Square shopping center. Its location allows ...
(Date:10/12/2017)... ... 2017 , ... The American College of Medical Informatics (ACMI) will present the ... Opening Session of AMIA’s Annual Symposium in Washington, D.C. AMIA’s Annual Symposium ... a pioneer in the field of medical informatics, this prestigious award is presented to ...
(Date:10/12/2017)... , ... October 12, 2017 , ... ... Hair Restoration, has recently contributed a medical article to the newly revamped ... Dr. Mohebi’s article spotlights the hair transplant procedure known as Follicular Unit ...
(Date:10/12/2017)... FL (PRWEB) , ... October 12, 2017 , ... On ... holding a treadmill relay – Miles by Moonlight to raise money for the American ... $300 or more. , Teams will work together to keep their treadmills moving ...
Breaking Medicine News(10 mins):
(Date:9/22/2017)... 22, 2017  As the latest Obamacare repeal effort ... Cassidy (R-LA) and Lindsey Graham (R-SC) ... medical device industry is in an odd place.  The ... 2.3% excise tax on medical device sales passed along ... covered patients, increased visits and hospital customers with the ...
(Date:9/19/2017)...   ZirMed Inc ., a recognized leader in cloud-based ... has been ranked #1 by its users for the seventh ... User Survey. ZirMed was recognized as the top-ranked end-to-end revenue ... centers over 200 beds and holds one of the longest ... history. ...
(Date:9/13/2017)... 13, 2017   OrthoAtlanta has been named the ... Host Committee (AFHC) for the 2018 College Football Playoff (CFP) ... at Mercedes-Benz Stadium in Atlanta, Georgia . ... "I,m In" campaign, participating in many activities leading up to, ... ...
Breaking Medicine Technology: