title: Hospital admissions related to influenza in France during the 2006/2007 epidemic.
abstract: BACKGROUND
  The data available on hospital admissions related to influenza mostly concern in-patients admitted via the emergency department. Severe cases have been collated by intensive care practitioners since 2009. For this survey, we searched French hospital admission databases to estimate the prevalence rate of hospital admissions related to influenza and to record qualitative data.
  
  
  METHODS
  All case studies identified between October 2006 and September 2007 were split into two groups: the first displaying symptoms of clinical influenza and the second suffering from influenza as an associated diagnosis.
  
  
  RESULTS
  We collected 6797 hospital admissions, 2126 of which were closely related to clinical influenza. Fifty percent of cases concerned the elderly and young people. Fifty-six hospital deaths were recorded in which influenza was the underlying cause in 21% of the cases (12). When influenza was an associated diagnosis (44/56), cardiovascular or respiratory diseases were the main causes (26/44).
  
  
  CONCLUSIONS
  During the same period (2006-2007), the French Sentinel Surveillance identified only 105 hospital admissions related to influenza. Our survey was therefore more exhaustive and was able to record qualitative data. Inclusion of hospital admissions with an associated diagnosis of influenza is debatable because this decreases specificity. The relationship between the principal diagnosis and all the associated diagnoses is difficult to study, although exclusion of this type of hospitalization could significantly underestimate these figures. Despite certain limitations, French hospital admissions databases should complement French Sentinel Surveillance data.
authors.affiliation: Observatoire Régional de la Santé (ORS) Pays de la Loire, Hôtel de la Région, 1 Rue de la Loire, 44966 Nantes Cedex 9, France. josiane.tomas@orspaysdelaloire.com
authors.forename: J
authors.initials: J
authors.lastname: Tomas
authors.forename: F
authors.initials: F
authors.lastname: Lelièvre
authors.forename: P
authors.initials: P
authors.lastname: Bercelli
authors.forename: P-Y
authors.initials: PY
authors.lastname: Glanddier
authors.forename: S
authors.initials: S
authors.lastname: Fanello
authors.forename: F
authors.initials: F
authors.lastname: Tuffreau
authors.forename: A
authors.initials: A
authors.lastname: Tallec
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D004636:Emergency Service, Hospital; D005602:France / Q000453:epidemiology; D019538:Health Care Surveys; D006801:Humans; D007223:Infant; D007251:Influenza, Human / Q000453:epidemiology* / Q000401:mortality; D008875:Middle Aged; D010343:Patient Admission / Q000706:statistics & numerical data*; D011159:Population Surveillance; D015995:Prevalence; D036301:Qualitative Research; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate