Any changes in prevalence of autism must be determined

doi:10.1136/bmj.324.7332.296a

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Mark F Blaxill, father of autistic child (Blaxill.Mark@BCG.com)

22 Fayerweather Street, Cambridge, MA 02138, USA

EDITOR—Because of the current concern over the rising incidence of autism the BMJ owes its readers better information than a letter based on comments by a focus group of interested parties.1 Would the journal have published a letter from a focus group of parents who believed that MMR vaccine (measles, mumps, and rubella vaccine) had caused their child's autism? I doubt it.

Rigorous methods are especially important because of a controversial current hypothesis.2 Fombonne has argued that despite reported …