Autism Spectrum Disorder (ASD) is a neurological developmental disability. It varies with age and different developmental stages. 
Autism is manifested differently in different people, which is why it is called - a spectrum disorder
Autism is mainly expressed in two aspects.
1. A consistent difficulty in maintaining social communication and/or interaction.
2. Repetitive patterns of behavior and/or actions and/or fields of interest. 
In order to determine whether a person has autism these two symptoms should coincide.

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