Asperger's syndrome is to be dropped from the psychiatrists' Diagnostic and Statistical Manual (DSM) of Mental Disorders, the American publication that is one of the most influential references for the profession around the world.

The term "Asperger's disorder" will not appear in the DSM-5, the latest revision of the manual, and instead its symptoms will come under the newly added "autism spectrum disorder", which is already used widely. That umbrella diagnosis will include children with severe autism, who often do not talk or interact, as well as those with milder forms.

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Full details of all the revisions will come in May 2013 when the American Psychiatric Association's new diagnostic manual is published. The changes will affect the diagnosis and treatment of millions of children and adults worldwide, as well as medical insurance and special education services.