Another Study Finds No Link Between MMR Vaccine and Autism

Dr. Paul A. Offit, director of the Vaccine Education Center and chief of infectious diseases at Children's Hospital of Philadelphia, also thinks the new study provides more conclusive evidence that there is no connection between autism and the MMR vaccine.

"The whole premise by Wakefield, that the measles component of [the] MMR vaccine caused a chronic intestinal inflammation that allowed harmful proteins to enter the bloodstream and ultimately the brain, causing autism, has not one shred of scientific evidence in its support," Offit said.

This new study follows the release last week of a study that showed the mercury preservative thimerosal, used in childhood vaccines until the turn of this century and thought by some to be associated with autism, doesn't remain in an infant's body long enough to build to dangerous levels.

And it follows a series of other studies, including a large-scale U.S. Institute of Medicine review in 2004, that failed to uncover a link between childhood vaccines and autism.

Current estimates by the U.S. National Institutes of Health say that one American child in 150 has been diagnosed with autism, although experts wonder if that increase is due in part to better diagnoses and a broader definition of the disorder.

More information

For more on autism, visit the U.S. National Institutes of Health.

SOURCES: Pauline A. Filipek, M.D., associate professor, pediatrics and neurology, University of California, Irvine; Paul A. Offit, M.D., director, Vaccine Education Center, and chief, infectious diseases, Children's Hospital of Philadelphia; February 2008Archives of Disease in Childhood