N Andrews1, E Miller2,
B Taylor3, R Lingam3, A
Simmons3, J Stowe2 and P Waight2
1 Statistics Unit, Public Health Laboratory
Service, 61 Colindale Avenue, London NW9 5EQ, UK 2 Immunisation Division, Communicable Disease Surveillance Centre,
Public Health Laboratory Service 3 Centre for Community Child Health, Royal Free and University
College Medical School, Royal Free Campus, University College London, London NW3
2PF, UK
Correspondence to:
Dr E Miller, Immunisation Division, Communicable Disease Surveillance Centre,
Public Health Laboratory Service, 61 Colindale Avenue, London NW9 5EQ, UK; emiller@phls.org.uk
ABSTRACT
Parents of autistic children with regressive symptoms who were
diagnosed after the publicity alleging a link with measles,mumps,
and rubella (MMR) vaccine tended to recall the onsetas shortly after
MMR more often than parents of similar childrenwho were diagnosed
prior to the publicity. This is consistentwith the recall bias
expected under such circumstances.
Keywords: MMR vaccine; autism; recall bias
Abbreviations: MMR, measles, mumps, and rubella; RI,
relative incidence
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