Nightly News | March 29, 2013
>>> we mentioned health news about a very controversyial topic, autism and childhood vaccine. a great many parents in this country believe there is a link and increasingly they are refusing to have their children immunized. but tonight there is brand-new data that adds to the case for vaccination on schedule. here with our report, our chief medical editor, dr. nancy snyderman .
>> reporter: despite years of research proving vaccines do not cause autism, nearly one in ten parents delayed or even refuses to vaccinate their children.
>> one of the questions i get asked is, is there any relationship between vaccines and autism?
>> reporter: a new report in the journal of pediatrics says there's no cause for concern and that getting multiple vaccinations, even on the same day, is not associated with an increased risk of developing autism.
>> there's no connection between vaccination and the development of autism.
>> reporter: analyzing records from more than 1,000 children and using data collected in the late '90s, researchers looked specifically atantigens that help create immunity. they found no link between the amount of exposure before the age of 2 and later developing autism. while the cdc now recommends more vaccinations than it did in the '90s, the level of antigens in today's vaccines is markedly lower than when this data was collected.
>> the market of vaccines that are in the current immunization schedule are what's needed to protect children.
>> reporter: the government encourages parents to vaccinate their children on schedule.
>> these are serious illnesses. we're talking about meningitis. we're talking about whooping cough. and it's important that we continue to protect and vaccinate our children. and this study that came out today is just one more piece of evidence to reassure parents that vaccines are safe.
>> reporter: not only safe but effective. and critical to protect babies and everyone else against life-threatening illnesses. dr. nancy snyderman , nbc news, new york.