According to the MIND institute, presenting at IMFAR:
The two most common causes of autism cited among all parents was an environmental cause (51%) and/or a genetic cause (51%). Vaccines (22%) were the third most commonly believed etiological factor, followed by 20% of parents who did not know or have a guess as to what may cause autism.
This is an interesting set of results to me. I’m frequently told that the overwhelming majority of parents believe vaccines cause autism. Turns out less than a quarter do.
Also of interest was the following statement:
Vaccines are commonly cited as a cause by parents in all ethnic groups despite a clear lack of scientific evidence demonstrating a relationship between autism and either the measles, mumps, rubella (MMR) vaccine, or thimerosal containing vaccines.
Wasn’t that long ago that autism anti-vaxxer supremo Rick Rollens was basically in charge of MIND. How times have changed.