title: Legionnaires' disease: overview of the situation concerning notification in Wallonia (Belgium) in 2012, a retrospective descriptive study based on a capture-recapture method.
abstract: BACKGROUND
  Legionnaires' disease is a severe form of pneumonia, and although public health medical inspectors must be notified, it is often under-reported. The objectives of this study were to determine the completeness rate of notification of Legionnaires' disease and to estimate the incidence of this disease in Wallonia, the southern part of Belgium, in 2012.
  
  
  METHODS
  This retrospective, transversal descriptive study was based on a capture-recapture method using two sources. An estimation of the total number of Legionnaires' disease cases was calculated using Chapman and Seber's estimators for small numbers, thereby allowing us to estimate the real incidence of this disease in Wallonia as well as the completeness rate of notification.
  
  
  RESULTS
  The total number of estimated Legionella cases for 2012 was 45 (IC 95%:41-48) and the completeness rate was 65% (IC 95%:61-70%). The estimated incidence of Legionnaires' disease in Wallonia was 1.27/100,000 inhabitants.
  
  
  CONCLUSIONS
  The notification rate of Legionella must be improved in Wallonia. Doctors should be made aware of the importance of diagnosing and reporting Legionnaires' disease.
authors: Infectious diseases surveillance, Fédération Wallonie-Bruxelles, Belgique, Direction générale de la santé, cellule de surveillance des maladies infectieuses, Boulevard Léopold II, 44, 1080 Bruxelles, Belgique.
authors: Stéphanie
authors: S
authors: Jacquinet
authors: department of microbiology, hôpital Erasme, Centre National de Référence des Légionelles, 1070 Bruxelles, Belgique ; Ecole de Santé Publique, Université Libre de Bruxelles, Campus Erasme - CP598 808 route de Lennik, 1070 Bruxelles, Belgique.
authors: Olivier
authors: O
authors: Denis
authors: Ecole de Santé Publique, Université Libre de Bruxelles, Campus Erasme - CP598 808 route de Lennik, 1070 Bruxelles, Belgique.
authors: Filomena Valente
authors: FV
authors: Soares
authors: Infectious diseases surveillance, Fédération Wallonie-Bruxelles, Belgique, Direction générale de la santé, cellule de surveillance des maladies infectieuses, Boulevard Léopold II, 44, 1080 Bruxelles, Belgique.
authors: Carole
authors: C
authors: Schirvel
keywords: Belgium; Legionnaires’ disease; Surveillance