Hospitalization following influenza infection and pandemic vaccination in multiple sclerosis patients: a nationwide population-based registry study from Norway.


Journal

European journal of epidemiology
ISSN: 1573-7284
Titre abrégé: Eur J Epidemiol
Pays: Netherlands
ID NLM: 8508062

Informations de publication

Date de publication:
Apr 2020
Historique:
received: 22 08 2019
accepted: 05 12 2019
pubmed: 25 12 2019
medline: 27 5 2020
entrez: 25 12 2019
Statut: ppublish

Résumé

Patients with multiple sclerosis (MS) are at increased risk of infections and related worsening of neurological function. Influenza infection has been associated with increased risk of various neurological complications. We conducted a population-based registry study to investigate the risk of acute hospitalization of MS patients in relation to influenza infection or pandemic vaccination in Norway. The entire Norwegian population in the years 2008-2014 was defined as our study population (N = 5,219,296). Information on MS diagnosis, influenza infection and vaccination were provided by Norwegian national registries. The self-controlled case series method was used to estimate incidence rate ratios (IRRs) with 95% confidence intervals (95% CI) in defined risk periods. 6755 MS patients were identified during the study period. Average age at first registration of an MS diagnosis was 51.8 years among men and 49.9 years among females (66.9%). The IRR for emergency hospitalization among MS patients the first week after an influenza diagnosis was 3.4 (95% CI 2.4-4.8). The IRR was 5.6 (95% CI 2.7-11.3) after pandemic influenza, and 4.8 (95% CI 3.1-7.4) after seasonal influenza. Pandemic vaccination did not influence risk of hospitalization [IRR within the first week: 0.7 (95% CI 0.5-1.0)]. Among MS patients, influenza infection was associated with increased risk for acute hospitalization while no increased risk was observed after pandemic vaccination. Influenza vaccination could prevent worsening of MS-related symptoms as well as risk of hospitalization.

Identifiants

pubmed: 31873811
doi: 10.1007/s10654-019-00595-2
pii: 10.1007/s10654-019-00595-2
pmc: PMC7222066
doi:

Substances chimiques

Influenza Vaccines 0

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

355-362

Subventions

Organisme : Reseach Council of Norway
ID : 262700

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Auteurs

Sara Ghaderi (S)

Department of Global Health and Primary Care, University of Bergen, Post Box 7804, 5020, Bergen, Norway. Sara.Ghaderi@uib.no.

Pål Berg-Hansen (P)

Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
Department of Neurology, Oslo University Hospital, Oslo, Norway.

Inger Johanne Bakken (IJ)

Centre for Fertility and Health, Norwegian Institute of Health, Oslo, Norway.

Per Magnus (P)

Centre for Fertility and Health, Norwegian Institute of Health, Oslo, Norway.

Lill Trogstad (L)

Department of Infectious Disease Epidemiology and Modelling, Norwegian Institute of Health, Oslo, Norway.

Siri Eldevik Håberg (SE)

Centre for Fertility and Health, Norwegian Institute of Health, Oslo, Norway.

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