A recent media release (see http://www.cdc.gov/media/releases/2014/p0327-autism-spectrum-disorder.html ) says
The Centers for Disease Control and Prevention (CDC) estimates that 1 in 68 children (or 14.7 per 1,000 eight-year-olds) in multiple communities in the United States has been identified with autism spectrum disorder (ASD). This new estimate is roughly 30 percent higher than previous estimates reported in 2012 of 1 in 88 children (11.3 per 1,000 eight year olds) being identified with an autism spectrum disorder. The number of children identified with ASD ranged from 1 in 175 children in Alabama to 1 in 45 children in New Jersey.
Note that recent (2012) Australian data on the prevalence of ASD shows 1 in 62 children in this country have a diagnosis ... see http://a4.org.au/a4/node/695 and http://a4.org.au/a4/node/622 There is nothing to celebrate in rising autism rates because people who are properly diagnosed with autism have significant disability that "requires support".
Levels of intellectual ability vary greatly among children with autism, ranging from severe intellectual challenges to average or above average intellectual ability. The study found that almost half of children identified with ASD have average or above average intellectual ability (an IQ above 85) compared to a third of children a decade ago.
The CDC also launched a new campaign ... "Birth to 5: Watch Me Thrive, is part of a coordinated federal effort to encourage developmental and behavioral screening and support for children, families, and the providers who care for them. Watch for updates at www.hhs.gov/watchmethrive " Here are some more stories: