Hepatitis B vaccine and the risk of CNS inflammatory demyelination in childhood
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Abstract
Background: The risk of CNS inflammatory demyelination associated with hepatitis B (HB) vaccine is debated, with studies reporting conflicting findings.
Methods: We conducted a population-based case-control study where the cases were children with a first episode of acute CNS inflammatory demyelination in France (1994–2003). Each case was matched on age, sex, and geographic location to up to 12 controls, randomly selected from the general population. Information on vaccinations was confirmed by a copy of the vaccination certificate. The odds ratios (ORs) of CNS inflammatory demyelination associated with HB vaccination were estimated using conditional logistic regression.
Results: The rates of HB vaccination in the 3 years before the index date were 24.4% for the 349 cases and 27.3% for their 2,941 matched controls. HB vaccination within this period was not associated with an increase in the rate of CNS inflammatory demyelination (adjusted OR, 0.74; 0.54–1.02), neither >3 years nor as a function of the number of injections or brand type. When the analysis was restricted to subjects compliant with vaccination, HB vaccine exposure >3 years before index date was associated with an increased trend (1.50; 0.93–2.43), essentially from the Engerix B vaccine (1.74; 1.03–2.95). The OR was particularly elevated for this brand in patients with confirmed multiple sclerosis (2.77; 1.23–6.24).
Conclusions: Hepatitis B vaccination does not generally increase the risk of CNS inflammatory demyelination in childhood. However, the Engerix B vaccine appears to increase this risk, particularly for confirmed multiple sclerosis, in the longer term. Our results require confirmation in future studies.
ADEM = acute disseminated encephalomyelitis; BCG = Bacille Calmette–Guèrin; HB = hepatitis B; MS = multiple sclerosis; OR = odds ratio.
Footnotes
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Editorial, page 870
e-Pub ahead of print on October 8, 2008, at www.neurology.org.
Funded by grants from the “Agence Française de Sécurité Sanitaire des Produits de Santé” (AFSSAPS), the “Agence Nationale de Recherche sur le SIDA et les hépatites” (ANRS), and the French Ministry of Health by a grant from the “Projet Hospitalier de Recherche Clinique” and by the “Direction Générale de la Santé.” S. Suissa holds a Distinguished Scientist award from the Canadian Institutes of Health Research (CIHR).
Disclosure: The authors report no disclosures.
Received March 21, 2008. Accepted in final form August 6, 2008.
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Letters: Rapid online correspondence
- Hepatitis B vaccine and the risk of CNS inflammatory demyelination in childhood
- Michel Lievre, Lyon 1 University, Service de Pharmacologie Clinique, Faculté de Médecine, rue Guillaume Paradin, 69008 Lyon, Franceml@upcl.univ-lyon1.fr
- Members of the Epidemiology working group of the French pharmacovigilance commission: Dominique Costagliola, Stephen Evans, Annie Fourrier, Jean-Louis Imbs, Daniel Levy-Bruhl, Louis Merle, Joelle Micallef, Emmanuel Oger
Submitted March 10, 2009 - Editor's Note
- Richard J. Kryscio, PhD, Associate Editor, Biostatistics, Neurologykpieper@neurology.org
Submitted March 10, 2009 - Hepatitis B vaccine and the risk of CNS inflammatory demyelination in childhood
- Alain Braillon, Department of Public Health, Hôpital Nord, 80054 Amiens CEDEX 1, Francebraillon.alain@chu-amiens.fr
- Gérard Dubois
Submitted December 05, 2008
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HEPATITIS B VACCINE AND THE RISK OF CNS INFLAMMATORY DEMYELINATION IN CHILDHOODM. Lièvre, Members of the Epidemiology Working Group of the French Pharmacovigilance Commission, D. Costagliola et al.Neurology, October 26, 2009