Maybe one of the reasons is that there is not a definitive diagnosis/screening, hence a significant rate of misdiagnosis. http://en.wikipedia.org/wiki/Autism#S

Maybe one of the reasons is that there is not a definitive diagnosis/screening, hence a significant rate of misdiagnosis. http://en.wikipedia.org/wiki/Autism#Screening http://en.wikipedia.org/wiki/Autism#Screening I've even seen claims of 1 in 120 people having some degree of autism which I find ludicrous: http://www.dailypennsylvanian.com/article/penn-study-discovers-increasing-autism-locally-and-nationally http://www.dailypennsylvanian.com/article/penn-study-discove...