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Cauchi M, Ball H, Ben-Shlomo Y, Robertson N. Interpretation of vaccine associated neurological adverse events: a methodological and historical review. J Neurol 2022; 269:493-503. [PMID: 34398270 PMCID: PMC8366487 DOI: 10.1007/s00415-021-10747-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 08/06/2021] [Indexed: 12/18/2022]
Abstract
As a result of significant recent scientific investment, the range of vaccines available for COVID-19 prevention continues to expand and uptake is increasing globally. Although initial trial safety data have been generally reassuring, a number of adverse events, including vaccine induced thrombosis and thrombocytopenia (VITT), have come to light which have the potential to undermine the success of the vaccination program. However, it can be difficult to interpret available data and put these into context and to communicate this effectively. In this review, we discuss contemporary methodologies employed to investigate possible associations between vaccination and adverse neurological outcomes and why determining causality can be challenging. We demonstrate these issues by discussing relevant historical exemplars and explore the relevance for the current pandemic and vaccination program. We also discuss challenges in understanding and communicating such risks to clinicians and the general population within the context of the 'infodemic' facilitated by the Internet and other media.
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Affiliation(s)
- Marija Cauchi
- Division of Psychological Medicine and Clinical Neuroscience, Department of Neurology, University Hospital of Wales, Cardiff University, Heath Park, Cardiff, CF14 4XN, UK.
| | - Harriet Ball
- Population Health Sciences, Bristol Medical School, Bristol, BS8 2PS UK
| | - Yoav Ben-Shlomo
- Population Health Sciences, Bristol Medical School, Bristol, BS8 2PS UK
| | - Neil Robertson
- Division of Psychological Medicine and Clinical Neuroscience, Department of Neurology, University Hospital of Wales, Cardiff University, Heath Park, Cardiff, CF14 4XN UK
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Overeem S, van Litsenburg RRL, Reading PJ. Sleep disorders and the hypothalamus. HANDBOOK OF CLINICAL NEUROLOGY 2021; 182:369-385. [PMID: 34266606 DOI: 10.1016/b978-0-12-819973-2.00025-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
As early as the 1920s, pathological studies of encephalitis lethargica allowed Von Economo to correctly identify hypothalamic damage as crucial for the profound associated sleep-related symptoms that helped define the condition. Only over the last 3 decades, however, has the key role of the hypothalamus in sleep-wake regulation become increasingly recognized. As a consequence, a close relation between abnormal sleep symptomatology and hypothalamic pathology is now widely accepted for a variety of medical disorders. Narcolepsy is discussed in some detail as the cardinal primary sleep disorder that is caused directly and specifically by hypothalamic pathology, most notably destruction of hypocretin (orexin)-containing neurons. Thereafter, various conditions are described that most likely result from hypothalamic damage, in part at least, producing a clinical picture resembling (symptomatic) narcolepsy. Kleine-Levin syndrome is a rare primary sleep disorder with intermittent symptoms, highly suggestive of hypothalamic involvement but probably reflecting a wider pathophysiology. ROHHAD (rapid-onset obesity with hypothalamic dysfunction, hypoventilation, and autonomic dysregulation) and Prader-Willi syndrome are also covered as hypothalamic syndromes with prominent sleep-related symptoms. Finally, sleep issues in several endocrine disorders are briefly discussed.
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Affiliation(s)
- Sebastiaan Overeem
- Center for Sleep Medicine, Kempenhaeghe, Heeze, The Netherlands; Biomedical Diagnostics Laboratory, Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.
| | - Raphaële R L van Litsenburg
- Psychooncology Group, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands; Department of Pedicatric Oncology, Cancer Center Amsterdam, Amsterdam, The Netherlands
| | - Paul J Reading
- Department of Neurology, James Cook University Hospital, Middlesbrough, United Kingdom
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Huang WT, Huang YS, Hsu CY, Chen HC, Lee HC, Lin HC, Hsieh CF, Wu MN, Yang CH. Narcolepsy and 2009 H1N1 pandemic vaccination in Taiwan. Sleep Med 2020; 66:276-281. [DOI: 10.1016/j.sleep.2018.10.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 09/30/2018] [Accepted: 10/11/2018] [Indexed: 12/23/2022]
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Granath F, Gedeborg R, Smedje H, Feltelius N. Change in risk for narcolepsy over time and impact of definition of onset date following vaccination with
AS03
adjuvanted pandemic
A/H1N1
influenza vaccine (
P
andemrix) during the 2009
H1N1
influenza pandemic. Pharmacoepidemiol Drug Saf 2019; 28:1045-1053. [DOI: 10.1002/pds.4788] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 03/11/2019] [Accepted: 03/25/2019] [Indexed: 01/02/2023]
Affiliation(s)
- Fredrik Granath
- Clinical Epidemiology Division, Department of Medicine SolnaKarolinska Institute Stockholm Sweden
| | - Rolf Gedeborg
- Department of Efficacy and Safety 1Medical Products Agency Uppsala Sweden
| | - Hans Smedje
- Department of Women's and Children's HealthKarolinska Institute Stockholm Sweden
| | - Nils Feltelius
- Department of Scientific ExpertiseMedical Products Agency Uppsala Sweden
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Cohet C, van der Most R, Bauchau V, Bekkat-Berkani R, Doherty TM, Schuind A, Tavares Da Silva F, Rappuoli R, Garçon N, Innis BL. Safety of AS03-adjuvanted influenza vaccines: A review of the evidence. Vaccine 2019; 37:3006-3021. [DOI: 10.1016/j.vaccine.2019.04.048] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 04/15/2019] [Accepted: 04/17/2019] [Indexed: 12/12/2022]
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Incidence rates of narcolepsy diagnoses in Taiwan, Canada, and Europe: The use of statistical simulation to evaluate methods for the rapid assessment of potential safety issues on a population level in the SOMNIA study. PLoS One 2018; 13:e0204799. [PMID: 30332477 PMCID: PMC6192586 DOI: 10.1371/journal.pone.0204799] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 09/07/2018] [Indexed: 12/21/2022] Open
Abstract
Background & objectives Vaccine safety signals require investigation, which may be done rapidly at the population level using ecological studies, before embarking on hypothesis-testing studies. Incidence rates were used to assess a signal of narcolepsy following AS03-adjuvanted monovalent pandemic H1N1 (pH1N1) influenza vaccination among children and adolescents in Sweden and Finland in 2010. We explored the utility of ecological data to assess incidence of narcolepsy following exposure to pandemic H1N1 virus or vaccination in 10 sites that used different vaccines, adjuvants, and had varying vaccine coverage. Methods We calculated incidence rates of diagnosed narcolepsy for periods defined by influenza virus circulation and vaccination campaign dates, and used Poisson regression to estimate incidence rate ratios (IRRs) comparing the periods during which wild-type virus circulated and after the start of vaccination campaigns vs. the period prior to pH1N1 virus circulation. We used electronic health care data from Sweden, Denmark, the United Kingdom, Canada (3 provinces), Taiwan, Netherlands, and Spain (2 regions) from 2003 to 2013. We investigated interactions between age group and adjuvant in European sites and conducted a simulation study to investigate how vaccine coverage, age, and the interval from onset to diagnosis may impact the ability to detect safety signals. Results Incidence rates of narcolepsy varied by age, continent, and period. Only in Taiwan and Sweden were significant time-period-by-age-group interactions observed. Associations were found for children in Taiwan (following pH1N1 virus circulation) and Sweden (following vaccination). Simulations showed that the individual-level relative risk of narcolepsy was underestimated using ecological methods comparing post- vs. pre-vaccination periods; this effect was attenuated with higher vaccine coverage and a shorter interval from disease onset to diagnosis. Conclusions Ecological methods can be useful for vaccine safety assessment but the results are influenced by diagnostic delay and vaccine coverage. Because ecological methods assess risk at the population level, these methods should be treated as signal-generating methods and drawing conclusions regarding individual-level risk should be avoided.
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Weibel D, Sturkenboom M, Black S, de Ridder M, Dodd C, Bonhoeffer J, Vanrolleghem A, van der Maas N, Lammers GJ, Overeem S, Gentile A, Giglio N, Castellano V, Kwong JC, Murray BJ, Cauch-Dudek K, Juhasz D, Campitelli M, Datta AN, Kallweit U, Huang WT, Huang YS, Hsu CY, Chen HC, Giner-Soriano M, Morros R, Gaig C, Tió E, Perez-Vilar S, Diez-Domingo J, Puertas FJ, Svenson LW, Mahmud SM, Carleton B, Naus M, Arnheim-Dahlström L, Pedersen L, DeStefano F, Shimabukuro TT. Narcolepsy and adjuvanted pandemic influenza A (H1N1) 2009 vaccines - Multi-country assessment. Vaccine 2018; 36:6202-6211. [PMID: 30122647 PMCID: PMC6404226 DOI: 10.1016/j.vaccine.2018.08.008] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 07/25/2018] [Accepted: 08/02/2018] [Indexed: 12/18/2022]
Abstract
BACKGROUND In 2010, a safety signal was detected for narcolepsy following vaccination with Pandemrix, an AS03-adjuvanted monovalent pandemic H1N1 influenza (pH1N1) vaccine. To further assess a possible association and inform policy on future use of adjuvants, we conducted a multi-country study of narcolepsy and adjuvanted pH1N1 vaccines. METHODS We used electronic health databases to conduct a dynamic retrospective cohort study to assess narcolepsy incidence rates (IR) before and during pH1N1 virus circulation, and after pH1N1 vaccination campaigns in Canada, Denmark, Spain, Sweden, Taiwan, the Netherlands, and the United Kingdom. Using a case-control study design, we evaluated the risk of narcolepsy following AS03- and MF59-adjuvanted pH1N1 vaccines in Argentina, Canada, Spain, Switzerland, Taiwan, and the Netherlands. In the Netherlands, we also conducted a case-coverage study in children born between 2004 and 2009. RESULTS No changes in narcolepsy IRs were observed in any periods in single study sites except Sweden and Taiwan; in Taiwan incidence increased after wild-type pH1N1 virus circulation and in Sweden (a previously identified signaling country), incidence increased after the start of pH1N1 vaccination. No association was observed for Arepanrix-AS03 or Focetria-MF59 adjuvanted pH1N1 vaccines and narcolepsy in children or adults in the case-control study nor for children born between 2004 and 2009 in the Netherlands case-coverage study for Pandemrix-AS03. CONCLUSIONS Other than elevated narcolepsy IRs in the period after vaccination campaigns in Sweden, we did not find an association between AS03- or MF59-adjuvanted pH1N1 vaccines and narcolepsy in children or adults in the sites studied, although power to evaluate the AS03-adjuvanted Pandemrix brand vaccine was limited in our study.
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Affiliation(s)
- Daniel Weibel
- Medical Informatics Department, Erasmus Medical Center, Rotterdam, The Netherlands.
| | - Miriam Sturkenboom
- Julius Global Health, University Utrecht Medical Center, Utrecht, The Netherlands
| | - Steven Black
- Cincinnati Children's Hospital, Cincinnati, OH, USA
| | - Maria de Ridder
- Medical Informatics Department, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Caitlin Dodd
- Medical Informatics Department, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Jan Bonhoeffer
- Infectiology and Vaccinology University Children's Hospital, Basel, Switzerland; Brighton Collaboration Foundation, Basel, Switzerland
| | - Ann Vanrolleghem
- Medical Informatics Department, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Nicoline van der Maas
- Dept. Epidemiology and Surveillance, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | - Gert Jan Lammers
- Leiden University Medical Centre, Leiden, The Netherlands; Sleep-Wake Center SEIN, Heemstede, The Netherlands
| | | | - Angela Gentile
- Hospital de Niños Ricardo Gutiérrez, Ciudad Autónoma de Buenos Aires, Argentina
| | - Norberto Giglio
- Hospital de Niños Ricardo Gutiérrez, Ciudad Autónoma de Buenos Aires, Argentina
| | - Vanesa Castellano
- Hospital de Niños Ricardo Gutiérrez, Ciudad Autónoma de Buenos Aires, Argentina
| | - Jeffrey C Kwong
- Institute for Clinical Evaluative Sciences (ICES), Ontario, Canada
| | - Brian J Murray
- Division of Neurology, Department of Medicine, Sunnybrook Health Sciences Centre, University of Toronto, Canada
| | | | - Diana Juhasz
- Institute for Clinical Evaluative Sciences (ICES), Ontario, Canada
| | | | | | - Ulf Kallweit
- Bern University Hospital and University of Bern, Bern, Switzerland; Witten/Herdecke University, Department of Rehabilitation, Witten/Herdecke, Germany
| | | | - Yu-Shu Huang
- Department of Child Psychiatry and Sleep Center, Chang Gung Memorial Hospital and University, Taoyuan, Taiwan
| | - Chung-Yao Hsu
- Department of Neurology and Sleep Disorders Center, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Hsi-Chung Chen
- Department of Psychiatry and Center of Sleep Disorders, National Taiwan University Hospital, Taipei, Taiwan
| | - Maria Giner-Soriano
- Institut Universitari d'Investigació en Atenció Primària Jordi Gol (IDIAP Jordi Gol), Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), Barcelona, Spain
| | - Rosa Morros
- Institut Universitari d'Investigació en Atenció Primària Jordi Gol (IDIAP Jordi Gol), Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), Barcelona, Spain
| | - Carles Gaig
- Neurology Service and Multidisciplinary Sleep Disorders Unit, Hospital Clinic of Barcelona, Barcelona, Spain
| | - Ester Tió
- Althaia Xarxa Assistencial Universitària de Manresa, Neurology Service, Manresa, Barcelona, Spain
| | - Silvia Perez-Vilar
- Medical Informatics Department, Erasmus Medical Center, Rotterdam, The Netherlands; Fundación para el Fomento de la Investigación Sanitaria y Biomédica de la Comunitat (FISABIO), Vaccine Research, Valencia, Spain
| | - Javier Diez-Domingo
- Fundación para el Fomento de la Investigación Sanitaria y Biomédica de la Comunitat (FISABIO), Vaccine Research, Valencia, Spain
| | | | | | - Salaheddin M Mahmud
- Vaccine and Drug Evaluation Centre, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Manitoba, Canada
| | - Bruce Carleton
- Faculty of Medicine, University of British Columbia, British Columbia, Canada
| | - Monika Naus
- Faculty of Medicine, University of British Columbia, British Columbia, Canada
| | - Lisen Arnheim-Dahlström
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Lars Pedersen
- Clinical Medicine/Epidemiology, Aarhus University, Aarhus, Denmark
| | - Frank DeStefano
- Centers for Disease Control and Prevention (CDC), Immunization Safety Office, Atlanta, USA
| | - Tom T Shimabukuro
- Centers for Disease Control and Prevention (CDC), Immunization Safety Office, Atlanta, USA
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Kårhus LL, Gunnes N, Størdal K, Bakken IJ, Tapia G, Stene LC, Håberg SE, Mårild K. Influenza and risk of later celiac disease: a cohort study of 2.6 million people. Scand J Gastroenterol 2018; 53:15-23. [PMID: 29076383 DOI: 10.1080/00365521.2017.1362464] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVES Influenza has been linked to autoimmune conditions, but its relationship to subsequent celiac disease (CD) is unknown. Our primary aim was to determine the risk of CD after influenza. A secondary analysis examined the risk of CD following pandemic influenza vaccination. METHODS This nationwide register-based cohort study included 2,637,746 Norwegians (born between 1967-2013) followed during 2006-2014 with information on influenza diagnosed in primary or non-primary care, pandemic vaccination (Pandemrix), and subsequent CD. Cox regression yielded hazard ratios adjusted (HR) for socio-demographic characteristics and earlier healthcare use. RESULTS During 13,011,323 person-years of follow-up 7321 individuals were diagnosed with CD (56/100,000 person-years). There were 351,666 individuals diagnosed with influenza, including 82,980 during the 2009-2010 pandemic, and 969,968 individuals were vaccinated. Compared with participants without influenza, who had a CD incidence of 55/100,000 person-years, those diagnosed with seasonal and pandemic influenza had a rate of 68 and 78, per 100,000 person-years, respectively. The HR for CD was 1.29 (95%CI, 1.21-1.38) after seasonal influenza and 1.29 (95%CI, 1.15-1.44) after pandemic influenza; HRs remained significantly increased one year after exposure, when restricted to laboratory-confirmed influenza, and after multivariate adjustments. The reverse association, i.e., risk of influenza after CD, was not significant (HR 1.05; 95%CI, 0.98-1.12). The HR for CD after pandemic vaccination was 1.08 (95%CI, 1.03-1.14). CONCLUSION A positive association with influenza diagnosis is consistent with the hypothesis that infections may play a role in CD development. We could neither confirm a causal association with pandemic vaccination, nor refute entirely a small excess risk.
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Affiliation(s)
- Line Lund Kårhus
- a Child Health, Norwegian Institute of Public Health , Oslo , Norway.,b Research Centre for Prevention and Health, Centre for Health, Capital Region of Denmark , Glostrup , Denmark
| | - Nina Gunnes
- a Child Health, Norwegian Institute of Public Health , Oslo , Norway
| | - Ketil Størdal
- a Child Health, Norwegian Institute of Public Health , Oslo , Norway.,c Department of Pediatrics , Østfold Hospital Trust , Grålum , Norway
| | | | - German Tapia
- a Child Health, Norwegian Institute of Public Health , Oslo , Norway
| | - Lars C Stene
- a Child Health, Norwegian Institute of Public Health , Oslo , Norway
| | - Siri E Håberg
- a Child Health, Norwegian Institute of Public Health , Oslo , Norway
| | - Karl Mårild
- a Child Health, Norwegian Institute of Public Health , Oslo , Norway
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Oberle D, Pavel J, Keller-Stanislawski B. Spontaneous reporting of suspected narcolepsy after vaccination against pandemic influenza A (H1N1) in Germany. Pharmacoepidemiol Drug Saf 2017; 26:1321-1327. [DOI: 10.1002/pds.4292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 07/17/2017] [Accepted: 07/19/2017] [Indexed: 12/24/2022]
Affiliation(s)
- Doris Oberle
- Department Safety of Medicinal Products and Medical Devices; Paul-Ehrlich-Institut, Federal Institute for Vaccines and Biomedicines; Langen Germany
| | - Jutta Pavel
- Department Safety of Medicinal Products and Medical Devices; Paul-Ehrlich-Institut, Federal Institute for Vaccines and Biomedicines; Langen Germany
| | - Brigitte Keller-Stanislawski
- Department Safety of Medicinal Products and Medical Devices; Paul-Ehrlich-Institut, Federal Institute for Vaccines and Biomedicines; Langen Germany
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10
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Sarkanen TO, Alakuijala APE, Dauvilliers YA, Partinen MM. Incidence of narcolepsy after H1N1 influenza and vaccinations: Systematic review and meta-analysis. Sleep Med Rev 2017; 38:177-186. [PMID: 28847694 DOI: 10.1016/j.smrv.2017.06.006] [Citation(s) in RCA: 130] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2017] [Revised: 05/22/2017] [Accepted: 06/14/2017] [Indexed: 11/18/2022]
Abstract
An increased incidence of narcolepsy was seen in many countries after the pandemic H1N1 influenza vaccination campaign in 2009-2010. The H1N1 vaccine - narcolepsy connection is based on observational studies that are prone to various biases, e.g., confounding by H1N1 infection, and ascertainment, recall and selection biases. A direct pathogenic link has, however, remained elusive. We conducted a systematic review and meta-analysis to analyze the magnitude of H1N1 vaccination related risk and to examine if there was any association with H1N1 infection itself. We searched all articles from PubMed, Web of Science and Scopus, and other relevant sources reporting the incidence and risk of post-vaccine narcolepsy. In our paper, we show that the risk appears to be limited to only one vaccine (Pandemrix®). During the first year after vaccination, the relative risk of narcolepsy was increased 5 to 14-fold in children and adolescents and 2 to 7-fold in adults. The vaccine attributable risk in children and adolescents was around 1 per 18,400 vaccine doses. Studies from Finland and Sweden also appear to demonstrate an extended risk of narcolepsy into the second year following vaccination, but such conclusions should be interpreted with a word of caution due to possible biases. Benefits of immunization outweigh the risk of vaccination-associated narcolepsy, which remains a rare disease.
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Affiliation(s)
- Tomi O Sarkanen
- Central Finland Central Hospital, Department of Neurology, Jyväskylä, Finland; University of Helsinki, Department of Neurological Sciences, Helsinki, Finland.
| | - Anniina P E Alakuijala
- University of Helsinki, Department of Neurological Sciences, Helsinki, Finland; HUS Medical Imaging Center, Helsinki University Central Hospital, Department of Clinical Neurophysiology, Finland
| | - Yves A Dauvilliers
- Gui-de-Chauliac Hospital, CHU Montpellier, Inserm, U1061, France; National Reference Centre for Orphan Diseases, Narcolepsy, Idiopathic hypersomnia and Kleine-Levin Syndrome, Sleep Disorders Center, France
| | - Markku M Partinen
- University of Helsinki, Department of Neurological Sciences, Helsinki, Finland; Helsinki Sleep Clinic, Vitalmed Research Centre, Finland
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Oberle D, Pavel J, Mayer G, Geisler P, Keller-Stanislawski B. Retrospective multicenter matched case-control study on the risk factors for narcolepsy with special focus on vaccinations (including pandemic influenza vaccination) and infections in Germany. Sleep Med 2017; 34:71-83. [PMID: 28522102 DOI: 10.1016/j.sleep.2017.02.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 01/23/2017] [Accepted: 02/14/2017] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Studies associate pandemic influenza vaccination with narcolepsy. In Germany, a retrospective, multicenter, matched case-control study was performed to identify risk factors for narcolepsy, particularly regarding vaccinations (seasonal and pandemic influenza vaccination) and infections (seasonal and pandemic influenza) and to quantify the detected risks. METHODS Patients with excessive daytime sleepiness who had been referred to a sleep center between April 2009 and December 2012 for multiple sleep latency test (MSLT) were eligible. Case report forms were validated according to the criteria for narcolepsy defined by the Brighton Collaboration (BC). Confirmed cases of narcolepsy (BC level of diagnostic certainty 1-4a) were matched with population-based controls by year of birth, gender, and place of residence. A second control group was established including patients in whom narcolepsy was definitely excluded (test-negative controls). RESULTS A total of 103 validated cases of narcolepsy were matched with 264 population-based controls. The second control group included 29 test-negative controls. A significantly increased odd ratio (OR) to develop narcolepsy (crude OR [cOR] = 3.9, 95% confidence interval [CI] = 1.8-8.5; adjusted OR [aOR] = 4.5, 95% CI = 2.0-9.9) was detected in individuals immunized with pandemic influenza A/H1N1/v vaccine prior to symptoms onset as compared to nonvaccinated individuals. Using test-negative controls, in individuals immunized with pandemic influenza A/H1N1/v vaccine prior to symptoms onset, a nonsignificantly increased OR of narcolepsy was detected when compared to nonvaccinated individuals (whole study population, BC levels 1-4a: cOR = 1.9, 95% CI = 0.5-6.9; aOR = 1.8, 95% CI = 0.3-10.1). CONCLUSIONS The findings of this study support an increased risk for narcolepsy after immunization with pandemic influenza A/H1N1/v vaccine.
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Affiliation(s)
- Doris Oberle
- Department Safety of Medicinal Products and Medical Devices, Paul-Ehrlich-Institut, Federal Institute for Vaccines and Biomedicines, Langen, Germany.
| | - Jutta Pavel
- Department Safety of Medicinal Products and Medical Devices, Paul-Ehrlich-Institut, Federal Institute for Vaccines and Biomedicines, Langen, Germany
| | - Geert Mayer
- Hephata-Klinik, Schlafzentrum, Schwalmstadt-Treysa, Germany
| | - Peter Geisler
- Sleep Disorders Center, Department of Psychiatry, University of Regensburg, Regensburg, Germany
| | - Brigitte Keller-Stanislawski
- Department Safety of Medicinal Products and Medical Devices, Paul-Ehrlich-Institut, Federal Institute for Vaccines and Biomedicines, Langen, Germany
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12
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Trogstad L, Bakken IJ, Gunnes N, Ghaderi S, Stoltenberg C, Magnus P, Håberg SE. Narcolepsy and hypersomnia in Norwegian children and young adults following the influenza A(H1N1) 2009 pandemic. Vaccine 2017; 35:1879-1885. [PMID: 28302408 DOI: 10.1016/j.vaccine.2017.02.053] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 02/20/2017] [Accepted: 02/23/2017] [Indexed: 01/24/2023]
Abstract
BACKGROUND Associations between influenza infection and sleep disorders are poorly studied. We investigated if pandemic influenza infection or vaccination with Pandemrix in 2009/2010 was associated with narcolepsy or hypersomnia in children and young adults. METHODS We followed the Norwegian population under age 30 from January 2008 through December 2012 by linking national health registry data. Narcolepsy diagnoses were validated using hospital records. Risks of narcolepsy or hypersomnia were estimated as adjusted hazard ratios (HRs) in Cox regression models with influenza infection and vaccination as time-dependent exposures. RESULTS Among the 1,638,526 persons under age 30 in Norway in 2009, 3.6% received a physician diagnosis of influenza during the pandemic, while 41.9% were vaccinated against pandemic influenza. Between October 1st 2009 and December 31st 2012, 72 persons had onset of narcolepsy and 305 were diagnosed with hypersomnia. The risk of a sleep disorder was associated with infection during the first six months, adjusted HR 3.31 with 95% confidence interval [CI], 1.01-10.79 for narcolepsy and adjusted HR 3.13 (95% CI, 1.12-8.76) for hypersomnia. The risk of narcolepsy was strongly associated with vaccination during the first six months adjusted HR 17.21 (95% CI, 6.28-47.14), while the adjusted HR for hypersomnia was 1.54 (95% CI, 0.81-2.93). CONCLUSIONS The study confirms an increased HR of narcolepsy following pandemic vaccination. Slightly increased HRs of narcolepsy and hypersomnia are also seen after influenza infection. However, the role of infection should be viewed with caution due to underreporting of influenza.
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Affiliation(s)
| | | | - Nina Gunnes
- Norwegian Institute of Public Health, Norway.
| | | | - Camilla Stoltenberg
- Norwegian Institute of Public Health, Norway; University of Bergen, Bergen, Norway.
| | - Per Magnus
- Norwegian Institute of Public Health, Norway; University of Oslo, Oslo, Norway.
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