"Controversy seems to follow autism like the tail on a kite," Dr. Bryan King, a researcher at Seattle Children's Autism Center and the University of Washington, wrote in an editorial published Tuesday in the Journal of the American Medical Association.
One that should be put to bed is any connection between autism spectrum disorder and the measles vaccine, according to a separate study published Tuesday in JAMA. It's the latest of at least a dozen studies, according to King, to show no connection.
Researchers examined data on more than 95,000 kids with older siblings, including almost 2,000 with an older sibling with autism spectrum disorder (ASD), to assess risk among those already at higher likelihood of developing autism because of a family connection.
Read MoreWhere we stand on autism
They found "no harmful association between MMR vaccine receipt and ASD even among children already at higher risk for ASD," wrote the study authors, led by Anjali Jain of the Lewin Group, a health-care consulting firm.