Titre :
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Legionella bacteria in shower aerosols increase the risk of Pontiac fever among older people in retirement homes. (2008)
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Auteurs :
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M. BAUER ;
M. DELOGE-ABARKAN ;
Philippe Hartemann ;
L. Mathieu ;
T. REMEN ;
P. TOSSA ;
Denis Zmirou-Navier ;
Inserm. Vandoeuvre lès Nancy. FRA ;
Nancy-University School of Medicine. Département Environnement-Santé. Vandoeuvre lès Nancy. FRA
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Type de document :
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Article
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Dans :
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Journal of epidemiology and community health (vol. 62, n° 10, 2008)
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Pagination :
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913-920
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Langues:
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Anglais
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Mots-clés :
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Legionella
;
Aérosol
;
Augmentation
;
Facteur risque
;
Risque
;
Fièvre
;
Personne âgée
;
Retraite
;
Bactérie
;
Personne retraitée
;
Homme
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Résumé :
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[BDSP. Notice produite par INIST-CNRS R0xBDAF7. Diffusion soumise à autorisation]. Background : 828 elderly subjects residing in nursing homes were followed up during 4 months to ascertain incidence of symptoms associated with Pontiac fever (PF) in a non-epidemic setting. Methods : The exposure situation was inhalation of Legionella bacteria while showering. An audit of the hot water system in all institutions allowed ascribing each subject to a water quality area where from one shower was sampled for Legionella assays at the end of the follow-up period. Legionella were detected in water and aerosols using the culture (CFU, colony forming units) and in situ hybridization (FISH) techniques. Results : Among 32 Pontiac-like episodes, 29 cases complied with the operational definition of PF elaborated for this study. Incidence density was 0.11 case/person-year (95% Cl 0.07 to 0.15). Water concentrations greater than 105 Legionella FISH/I and 104 Legionella CFU/I were associated with an increased risk of PF (respectively RR 2.23, p=0.05 and RR 2.39, p=0.11, with significant dose-response patterns : p for trend
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