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lüll Prevention of Legionnaires disease in hospitals Sarjomaa M; Urdahl P; Ramsli E; Borchgrevink-Lund CF; Ask ETidsskr Nor Laegeforen 2011[Aug]; 131 (16): 1554-7BACKGROUND: The first instance of Legionella infection in a Norwegian hospital was confirmed in 2005. We describe the best-known methods of eradicating Legionella in hospitals. MATERIALS AND METHOD: The article is based on the authors' experience of measures to prevent Legionnaires' disease in hospitals and on a non-systematic search in PubMed. RESULTS: There are several methods of combating Legionella in hospitals. These include chlorination, heat treatment, and the use of filters. However, recontamination easily re-occurs after eradication. The silver and copper ionisation treatment of water is a well-documented method for the systematic and long-term eradication of Legionella in water. The disadvantages of this method are that it is expensive, that there is a risk of discolouring the water, and that there is a possibility of developing resistance in environmental bacteria. This resistance mechanism can theoretically be transferred to bacteria that cause illness. INTERPRETATION: We recommend the silver and copper ionisation treatment of water as a method of preventing nosocomial Legionnaires' disease when standard methods fail and there is a high prevalence of Legionella in the water. The discolouration of operation instruments that occurs as a result of high silver concentrations can be avoided by using a separate water supply for operation units.|Cross Infection/microbiology/*prevention & control[MESH]|Disinfection[MESH]|Filtration[MESH]|Hot Temperature[MESH]|Humans[MESH]|Infection Control/*methods[MESH]|Legionella pneumophila/drug effects/radiation effects[MESH]|Legionnaires' Disease/microbiology/*prevention & control[MESH]|Ultraviolet Rays[MESH]|Water Microbiology[MESH]|Water Purification/methods[MESH]|Water Supply[MESH] |