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Repeat capture–recapture studies as part of the evaluation of the surveillance of Legionnaires' disease in France

Published online by Cambridge University Press:  23 September 2003

A. NARDONE
Affiliation:
Institut de Veille Sanitaire, Saint-Maurice, France European Programme for Intervention Epidemiology Training (EPIET), Institut de Veille Sanitaire, Saint-Maurice, France
B. DECLUDT
Affiliation:
Institut de Veille Sanitaire, Saint-Maurice, France
S. JARRAUD
Affiliation:
Centre National de Référence des Legionella, Lyon, France
J. ETIENNE
Affiliation:
Centre National de Référence des Legionella, Lyon, France
B. HUBERT
Affiliation:
Institut de Veille Sanitaire, Saint-Maurice, France
A. INFUSO
Affiliation:
Institut de Veille Sanitaire, Saint-Maurice, France
A. GALLAY
Affiliation:
Institut de Veille Sanitaire, Saint-Maurice, France
J.-C. DESENCLOS
Affiliation:
Institut de Veille Sanitaire, Saint-Maurice, France
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Abstract

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We evaluated improvements made to the mandatory notification surveillance system for Legionnaires' disease in France by estimating its sensitivity in 1995 and 1998 using a repeat capture–recapture method. A case of Legionnaires' disease was defined as a person treated for pneumonia in whom legionella had been detected. Patient details were collected from (1) mandatory notifications; (2) the National Reference Centre for Legionella; (3) a postal survey of all hospital laboratories. The three sources were cross-matched and 715 individual cases were identified. A log-linear model, which included an interaction term between mandatory notifications and both the National Reference Centre and Laboratory sources, provided an estimated total of 1124 cases (95% CI 973–1275) in 1998, a twofold increase compared with 1995. The sensitivity of the surveillance system improved from 10% in 1995 to 33% (95% CI 29–38%) in 1998. Capture-recapture methods are important tools in the evaluation of surveillance systems.

Type
Research Article
Copyright
© 2003 Cambridge University Press