None - autism is a neuological difference, there's nothing about autism that could cause death.
I don't know how many people have seizure disorders that are on the autism spectrum. I have when I was experienced it as a small child. There is truly no knowing how many people nowadays in the autism spectrum have seizure disorders.
Autism is not mental or physical per say, nor is it always a disability. Autism is a neurological difference - some people with autism do consider themselves disabled because of the way autism effects them, but many autistic people live just like neurotypical people so do not consider their autism to be a disability at all.
Of course they can. Children with Autism can reach whatever career they choose. Temple Grandin is a very famous person with Autism, and she has written many great books about Autism.
No one 'gets' autism, it's not a disease someone can catch - autism is a neurological difference, Autistic people are born Autistic. Currently rates of diagnosis are around 1 in 55, but we have no way of knowing for sure how many people may be Autistic but not diagnosed.
Autism awareness is simply making people aware of autism and Autistic people. Unfortunately organizations such as Autism Speaks uses autism awareness to speak negatively about autism and Autistic people to increase their profits, thus there remains a lot of ignorance about autism.
100-800
It would not be ethical or legal to do anything TO people who have autism.
Yes people with autism do repeat them self's.
The CDC have put Autism diagnosis at 1 in 68 within the US. We don't know how many people are Autistic because not that many people are diagnosed, many may not even know they're Autistic.
You can't die as a result of having autism. In some cases autism is so severe that autistic people may not see potential harm such as oncoming trafic or falling into rivers, but this is uncommon. The biggest risk with autism is not the autism itself but prejudice towards autism, unfortunately many parents murder their autistic children or autistic people can be abused to the point of being killed.
Not all people with anger have autism but autistic people do tend to have anger issues