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Article Dans Une Revue Journal of Materials and Environmental Science Année : 2014

Risk factors of Legionella occurrence in nursing homes hot-water systems

Résumé

Legionella contamination was studied in 34 nursing homes hot-water systems. A critical points analysis was conducted in each home in order to evaluate risk factors for occurrence of Legionella bacteria across four components of the water systems: cold water system feeding the hot-water production, hot-water production, hot-water distribution system and points-of-use. Risk factors were scaled according to criticity levels (1 to 4) and related to the prevalence and intensity of Legionella contamination. Hot-water of the nursing homes was contaminated by culturable Legionella (24.6%) and by Legionella detected using the in situ hybridization (FISH) technique (48.5%). Logistic regressions showed that criticity levels of hot-water system were predictive of hot-water contamination by culturable Legionella for two major components: "hot-water production" and "hot-water distribution system", and to a lesser extent for the "points-of-use" component. These results also hold true for the "points-of-use" criticity levels according to Legionella bacteria detected by FISH. In conclusion, because it shows a strong relationship between Legionella prevalence and critical points analysis of the water system, this study provides some tools for Legionella risk management.
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Dates et versions

hal-03749857 , version 1 (11-08-2022)

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  • HAL Id : hal-03749857 , version 1

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M Deloge, S Oberti, N Dhome, D Zmirou-Navier, L. Mathieu. Risk factors of Legionella occurrence in nursing homes hot-water systems. Journal of Materials and Environmental Science , 2014. ⟨hal-03749857⟩

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