Navigation Links
Another Study Sees No Vaccine-Autism Link

By Amy Norton
HealthDay Reporter

FRIDAY, March 29 (HealthDay News) -- Although some parents worry about the sheer number of vaccines babies typically receive, a new U.S. government study finds no evidence that more vaccinations increase the risk of autism.

Looking at about 1,000 U.S. children with or without autism, researchers at the Centers for Disease Control and Prevention found no connection between early childhood vaccinations and autism risk.

Children with autism and those without had the same total exposure to vaccine antigens -- the substances in vaccines that trigger the immune system to develop infection-fighting antibodies.

"This should give more reassurance to parents," said lead researcher Dr. Frank DeStefano, director of the CDC's Immunization Safety Office.

The findings, which appear online March 29 in the Journal of Pediatrics, cast further doubt on a link between vaccines and autism spectrum disorders -- a group of developmental brain disorders that impair a child's ability to communicate and socialize.

The first worries came from a small British study in 1998 that proposed a connection between the measles-mumps-rubella (MMR) vaccine and autism. A spate of research since has found no link, and the original study was eventually retracted by the Lancet, the journal that published it.

Then came concerns about thimerosal, a preservative once used in certain childhood vaccines (but never MMR) that contains small amounts of ethyl mercury. Again, international studies failed to show a link to autism.

More recently, worries have shifted to the notion that children are getting "too many vaccinations, too soon." In the United States, children can be immunized against 14 different diseases by the time they are 2.

DeStefano said his team focused on antigen exposure, rather than just the number of vaccinations, because that gives a more precise idea of the "immune system stimulation" kids received through vaccines.

A recent survey found that about one-third of parents thought children receive too many vaccinations in their first two years of life, and that the shots could contribute to autism.

But there's no scientific evidence of that, said Dr. Paul Offit, chief of infectious diseases at the Children's Hospital of Philadelphia.

He said it's understandable that parents might worry. "You see your baby receiving all these vaccines. It looks like too much. It feels like too much," Offit said.

But, he said, there's no biological basis for the idea that vaccines "overstimulate" the immune system, and that somehow leads to autism.

Every day, babies' immune systems battle many more antigens than are present in vaccines, DeStefano explained. "Most infants can handle exposure to many antigens," he said.

The findings are based on 256 children with an autism spectrum disorder and 752 autism-free kids who were matched to them based on age, sex and health insurance plan.

The CDC team found that kids' total antigen exposure in the first two years of life was unrelated to their risk of developing an autism disorder.

That was also true when they considered babies' antigen exposure in the first three months of life, and the first seven months. Nor was there any connection between autism risk and the amount of vaccine antigens children received on any single day.

"This provides evidence that concerns about immune system overstimulation are unfounded," DeStefano said.

Geraldine Dawson, chief science officer for the advocacy group Autism Speaks, said the study "adds to the existing literature showing no connection between vaccines and autism in large epidemiological studies."

She added, though, that further research is needed "to explore whether, in rare cases, a genetic vulnerability might increase susceptibility to vaccine-related side effects, including the triggering of autism symptoms in a genetically and medically susceptible child."

Both Offit and DeStefano stressed that there is no reason for parents to delay vaccinating their child.

"This is one more piece of evidence to help reassure parents," Offit said.

More information

The American Academy of Pediatrics has information on vaccine safety.

SOURCES: Frank DeStefano, M.D., M.P.H., director, Immunization Safety Office, U.S. Centers for Disease Control and Prevention, Atlanta; Paul Offit, M.D., chief, infectious diseases, Children's Hospital of Philadelphia; Geraldine Dawson, Ph.D., chief science officer, Autism Speaks, New York City; March 29, 2013, Journal of Pediatrics, online

Copyright©2012 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Another Danger of Depression?
2. Another Painful Period…or a Problem? Understanding Endometriosis
3. Another Study Says Mediterranean Diet Good for the Heart
4. FDA Issues Another Warning on Fake Version of Cancer Drug Avastin
5. 2012 Marks Another Year of Expansion and Growth for OzLINK
6. US Drug Watchdog Now Urges All Metal on Metal Hip Implant Failure Victims To Get A New Opinion From Another Orthopedic Surgeon Before They Get Stuck With a New Problem
7. Vaccines Might Become Another Way to Fight Cancer
8. Deer Ticks Carry Yet Another Bacterial Threat
9. Law Firm of Garcia & Phan Settles Another "Pre-litigation Settlement" for Online Trademark/Copyright Infringement on Behalf of their Client CortiSLIM® International
10. US Drug Watchdog Now Fears Thousands of Senior Citizen Recipients Of A All Metal Hip Implant Are Not Complaining About A Failure Because They Don't Want Another Surgery
11. Climate Change May Bring Another Mosquito-Borne Illness to U.S.
Post Your Comments:
Related Image:
Another Study Sees No Vaccine-Autism Link
(Date:10/13/2015)... ... , ... The added calories and sugar in an average trick-or-treat bag may ... to do? Registered dietitians from Retrofit , the leading corporate weight management program, ... , “Halloween is a high-calorie holiday,” said Dara Aronow, Registered Dietitian, Retrofit. “Use this ...
(Date:10/13/2015)... ... ... The American Institutes for Research ( AIR ) developed a collection of ... experienced sexual assault and other trauma. The toolkit, funded by the U.S. Department of ... Act's 21st anniversary. , AIR developed the Safe Place toolkit ...
(Date:10/13/2015)... (PRWEB) , ... October 13, 2015 , ... ... enterprise focused on cancer patients, today announced a new partnership with the ... battling this rare type of non-Hodgkin’s lymphoma, their families and physicians. , ...
(Date:10/13/2015)... ... October 13, 2015 , ... PhyMed Healthcare Group , ... its partnership with WPC Healthcare , a provider of predictive analytics solutions ... data into an aggregated data repository necessary to perform reporting and analytics on ...
(Date:10/13/2015)... ... 13, 2015 , ... ProText Kinetic Panel is a typography creation tool made ... can create energetic text animations in any layout without the use of keyframes. Using ... timeline and stylize the text. With intuitive on-screen controls, users can re-position and scale ...
Breaking Medicine News(10 mins):
(Date:10/13/2015)... 13, 2015  Synapse Biomedical Inc. ( ) ... (PAS) studying the use of the NeuRx ® ... enroll patients. the United States ... market-approved criteria. The PAS study group met their initial ... study has since expanded the enrollment target to 150 ...
(Date:10/13/2015)... 2015  SeraCare Life Sciences, a leading partner to ... company,s precision medicine business unit has launched its second ... next-generation sequencing (NGS)-based tumor profiling assays.  The Seraseq TM ... mixture of mutations in key oncogenes and tumor suppressor ... , but is offered at five additional allele frequencies. ...
(Date:10/13/2015)... , Oct. 13 2015 ... the addition of the "US & ... 16 Countries (2010-2021)" report to their ... announced the addition of the "US ... - 16 Countries (2010-2021)" report to ...
Breaking Medicine Technology: