Around one in every 30 children and adolescents in America have autism, a new study finds. Autism rates in America have jumped 50% from 2017 to 2020, after a heavy drop from 2016 to 2017.Around one in every 30 children and adolescents in America have autism, a new study finds. Autism rates in America have jumped 50% from 2017 to 2020, after a heavy drop from 2016 to 2017.Read MoreHealth News | Mail Online