Autism Spectrum Disorder is a neurological condition, autistic people are born autistic - we do not know why people are autistic.

Someone who is born on the autism spectrum/has autism spectrum disorder/is autistic.

Often used in an offensive manner towards autistic people.

Kim peek has a disease called autistic savant

1 in 100 of the population have autistic spectrum disorder. 0.2% are female, and 1.8% are male.

There's no such thing as a 'minor case of autism', you're either Autistic or you're not. If you are Autistic it is more likely that your children will be Autistic too as it is genetic.