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August 27, 2019; 93 (9) Article

A large case-control study on vaccination as risk factor for multiple sclerosis

View ORCID ProfileAlexander Hapfelmeier, Christiane Gasperi, Ewan Donnachie, View ORCID ProfileBernhard Hemmer
First published July 30, 2019, DOI: https://doi.org/10.1212/WNL.0000000000008012
Alexander Hapfelmeier
From the Institute of Medical Informatics, Statistics and Epidemiology (A.H.), and Department of Neurology, Klinikum rechts der Isar (C.G., B.H.), Technical University of Munich; National Association of Statutory Health Insurance Physicians of Bavaria (E.D.); and Munich Cluster for Systems Neurology (SyNergy) (B.H.), Munich, Germany.
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Christiane Gasperi
From the Institute of Medical Informatics, Statistics and Epidemiology (A.H.), and Department of Neurology, Klinikum rechts der Isar (C.G., B.H.), Technical University of Munich; National Association of Statutory Health Insurance Physicians of Bavaria (E.D.); and Munich Cluster for Systems Neurology (SyNergy) (B.H.), Munich, Germany.
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Ewan Donnachie
From the Institute of Medical Informatics, Statistics and Epidemiology (A.H.), and Department of Neurology, Klinikum rechts der Isar (C.G., B.H.), Technical University of Munich; National Association of Statutory Health Insurance Physicians of Bavaria (E.D.); and Munich Cluster for Systems Neurology (SyNergy) (B.H.), Munich, Germany.
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Bernhard Hemmer
From the Institute of Medical Informatics, Statistics and Epidemiology (A.H.), and Department of Neurology, Klinikum rechts der Isar (C.G., B.H.), Technical University of Munich; National Association of Statutory Health Insurance Physicians of Bavaria (E.D.); and Munich Cluster for Systems Neurology (SyNergy) (B.H.), Munich, Germany.
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A large case-control study on vaccination as risk factor for multiple sclerosis
Alexander Hapfelmeier, Christiane Gasperi, Ewan Donnachie, Bernhard Hemmer
Neurology Aug 2019, 93 (9) e908-e916; DOI: 10.1212/WNL.0000000000008012

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Abstract

Objective To investigate the hypothesis that vaccination is a risk factor for multiple sclerosis (MS) by use of German ambulatory claims data in a case-control study.

Methods Using the ambulatory claims data of the Bavarian Association of Statutory Health Insurance Physicians covering 2005–2017, logistic regression models were used to assess the relation between MS (n = 12,262) and vaccinations in the 5 years before first diagnosis. Participants newly diagnosed with Crohn disease (n = 19,296) or psoriasis (n = 112,292) and participants with no history of these autoimmune diseases (n = 79,185) served as controls.

Results The odds of MS were lower in participants with a recorded vaccination (odds ratio [OR] 0.870, p < 0.001 vs participants without autoimmune disease; OR 0.919, p < 0.001 vs participants with Crohn disease; OR 0.973, p = 0.177 vs participants with psoriasis). Lower odds were most pronounced for vaccinations against influenza and tick-borne encephalitis. These effects were consistently observed for different time frames, control cohorts, and definitions of the MS cohort. Effect sizes increased toward the time of first diagnosis.

Conclusions Results of the present study do not reveal vaccination to be a risk factor for MS. On the contrary, they consistently suggest that vaccination is associated with a lower likelihood of being diagnosed with MS within the next 5 years. Whether this is a protective effect needs to be addressed by future studies.

Glossary

BASHIP=
Bavarian Association of Statutory Health Insurance Physicians;
CI=
confidence interval;
GOP=
Gebührenordnungspositionen;
HPV=
human papilloma virus;
ICD-10=
International Classification of Diseases–10;
MMR=
measles, mumps, and rubella;
MS=
multiple sclerosis;
OR=
odds ratio;
TBE=
tick-borne encephalitis;
VZV=
varicella-zoster virus

Footnotes

  • Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.

  • ↵* These authors contributed equally to this work.

  • Editorial, Page 377

  • Podcast: NPub.org/b4quxb

  • CME Course: NPub.org/cmelist

  • Received February 20, 2019.
  • Accepted in final form April 29, 2019.
  • © 2019 American Academy of Neurology
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