PEDIATRICS Vol. 104 No. 1 July 1999, p. e12
ELECTRONIC ARTICLE:
Previous Exposure to Measles, Mumps, and Rubella
but Not
Vaccination During Adolescence
Correlates to the Prevalence of
Pancreatic and Thyroid Autoantibodies
Received Nov 12, 1998; accepted Feb 2, 1999.
,
,
,
From the Departments of * Pediatrics,
Clinical Microbiology,
§ Clinical Research, and ¶ Endocrinology, Malmö University
Hospital, Malmö, Sweden; Departments of
Pediatrics and
# Medicine, University Hospital, Lund University, Lund, Sweden; the
Department of ** Pediatrics, University of Linköping; and the
Department of 
Medicine, University of Washington, Seattle,
Washington.
Objective. This study was designed to
determine whether a relationship exists between previous exposure to
measles, mumps, and rubella (MMR) by natural infection or vaccination
or by new immunization with MMR vaccine, and either the presence or
levels of autoantibodies against thyroid cell and pancreatic
-cell
antigens.
Methods. Antibodies against MMR and autoantibodies against thyroglobulin, thyroid peroxidase, pancreas islet cells (ICA), islet cell surface, glutamic acid decarboxylase 65k autoantibodies, and insulin were studied before, and 3 months after, vaccination with combined MMR vaccine in 386 school children between 11 and 13 years of age.
Results. The vaccination changed neither the prevalence nor the level of autoantibodies. Children with rubella antibodies before vaccination had higher levels of ICA than did the rubella seronegative children. In contrast, thyroid autoantibody levels and prevalence were lower in children with antibodies against measles, mumps, or both before vaccination than in children without those antibodies.
Conclusions. Previous natural infection or vaccination against measles, mumps, or both seemed to have an inhibitory effect on the development of thyroid autoantibodies. In contrast, children with previous exposure to rubella had higher levels of ICA. No evidence was found that MMR vaccination during adolescence may trigger autoimmunity. Key words: autoantibodies, thyroiditis, type 1 diabetes mellitus, vaccination, virus.
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