No Link Found between Vaccine Mercury and Autism

"This is a very reassuring study," said Dr. Michael J. Smith, a pediatrician at the University of Louisville School of Medicine in Kentucky who was not involved in the research.

"These data show that you could receive a thimerosal vaccine and not be concerned about it."

Smith, who said he has a fully vaccinated two-month-old at home, noted that autism rates have continued to rise, although thimerosal has been removed from all routine childhood vaccines, except flu shots.

For parents who remain concerned about thimerosal in the flu shots, he said there are alternatives without the preservative, such as FluMist, a nasal spray that can be used in children aged two and older.

Some parents have also worried that giving too many shots at once, or in children who are too young, could cause mental problems. Smith said studies had dispelled those concerns one by one.

"There is no credible evidence" for a link between vaccines and autism, he told Reuters Health.