social factors related to the clinical severity of influenza cases in spain during the a (h1n1) 2009 virus pandemic社会因素与西班牙的流感病例的临床严重程度在2009年h1n1流感病毒大流行.pdf

Mayoral et al. BMC Public Health 2013, 13:118 /1471-2458/13/118 RESEARCH ARTICLE Open Access Social factors related to the clinical severity of influenza cases in Spain during the A (H1N1) 2009 virus pandemic 1,17* 2,3 2,3 4 5 3 José María Mayoral , Jordi Alonso , Olatz Garín , Zaida Herrador , Jenaro Astray , Maretva Baricot , 3,6 3,7 8 3,9 3 3,10 Jesús Castilla , Rafael Cantón , Ady Castro , Miguel Delgado-Rodríguez , Alicia Ferri , Pere Godoy , Fernando Gónzález-Candelas3,11 3,12 13 3,14 3 , Vicente Martín , Tomás Pumarola , José María Quintana , Núria Soldevila , Sonia Tamames15, Ángela Domínguez3,16 and the CIBERESP Cases and Controls in Pandemic Influenza Working Group, Spain 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 pandem