See <a href="http://bmj.bmjjournals.com/cgi/eletters/326/7380/71#28684">http://bmj.bmjjournals.com/cgi/eletters/326/7380/71#28684</a> Environmental factors such as the effect of synergistic action between the three combined live virus components of MMR vaccine on gut and neurological immune processes , cannot be so confidently dismissed by epidemiological population studies of medical database records , as ASD is a disorder with no single phenotype, rather than a dis