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BMC Public Health
Published in: BMC Public Health 1/2013

Open Access 01-12-2013 | Research article

Social factors related to the clinical severity of influenza cases in Spain during the A (H1N1) 2009 virus pandemic

Authors: José María Mayoral, Jordi Alonso, Olatz Garín, Zaida Herrador, Jenaro Astray, Maretva Baricot, Jesús Castilla, Rafael Cantón, Ady Castro, Miguel Delgado-Rodríguez, Alicia Ferri, Pere Godoy, Fernando Gónzález-Candelas, Vicente Martín, Tomás Pumarola, José María Quintana, Núria Soldevila, Sonia Tamames, Ángela Domínguez, and the CIBERESP Cases and Controls in Pandemic Influenza Working Group, Spain

Published in: BMC Public Health | Issue 1/2013

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Abstract

Background

During the 2009 influenza pandemic, a change in the type of patients most often affected by influenza was observed. The objective of this study was to assess the role of individual and social determinants in hospitalizations due to influenza A (H1N1) 2009 infection.

Methods

We studied hospitalized patients (cases) and outpatients (controls) with confirmed influenza A (H1N1) 2009 infection. A standardized questionnaire was used to collect data. Variables that might be related to the hospitalization of influenza cases were compared by estimation of the odds ratio (OR) and 95% confidence intervals (CI) and the variables entered into binomial logistic regression models.

Results

Hospitalization due to pandemic A (H1N1) 2009 influenza virus infections was associated with non-Caucasian ethnicity (OR: 2.18, 95% CI 1.17 − 4.08), overcrowding (OR: 2.84, 95% CI 1.20 − 6.72), comorbidity and the lack of previous preventive information (OR: 2.69, 95% CI: 1.50 − 4.83). Secondary or higher education was associated with a lower risk of hospitalization (OR 0.56, 95% CI: 0.36 − 0.87)

Conclusions

In addition to individual factors such as comorbidity, other factors such as educational level, ethnicity or overcrowding were associated with hospitalization due to A (H1N1) 2009 influenza virus infections.
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Metadata
Title
Social factors related to the clinical severity of influenza cases in Spain during the A (H1N1) 2009 virus pandemic
Authors
José María Mayoral
Jordi Alonso
Olatz Garín
Zaida Herrador
Jenaro Astray
Maretva Baricot
Jesús Castilla
Rafael Cantón
Ady Castro
Miguel Delgado-Rodríguez
Alicia Ferri
Pere Godoy
Fernando Gónzález-Candelas
Vicente Martín
Tomás Pumarola
José María Quintana
Núria Soldevila
Sonia Tamames
Ángela Domínguez
and the CIBERESP Cases and Controls in Pandemic Influenza Working Group, Spain
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Public Health / Issue 1/2013
Electronic ISSN: 1471-2458
DOI
https://doi.org/10.1186/1471-2458-13-118

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