{"id":2877,"date":"2020-03-03T12:11:45","date_gmt":"2020-03-03T11:11:45","guid":{"rendered":"https:\/\/www.umweltperspektiven.ch\/?p=2877"},"modified":"2022-02-09T11:10:50","modified_gmt":"2022-02-09T10:10:50","slug":"legionaerskrankheit-eawag-startet-projekt-zur-legionellen-bekaempfung-in-gebaeuden","status":"publish","type":"post","link":"https:\/\/www.organisator.ch\/fr\/sustainability\/2020-03-03\/legionaerskrankheit-eawag-startet-projekt-zur-legionellen-bekaempfung-in-gebaeuden\/","title":{"rendered":"L\u00e9gionellose : l'EAWAG lance un projet de lutte contre les l\u00e9gionelles dans les b\u00e2timents"},"content":{"rendered":"<figure id=\"attachment_2878\" aria-describedby=\"caption-attachment-2878\" style=\"width: 680px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-2878\" src=\"\/\/www.umweltperspektiven.ch\/wp-content\/uploads\/2020\/03\/Legions\u00e4rskrankheit-Legionellen_EAWAG-UP_Umwelt-Perspektiven.jpg\" alt=\"\" width=\"680\" height=\"461\" \/><figcaption id=\"caption-attachment-2878\" class=\"wp-caption-text\">Les donn\u00e9es de l'Office f\u00e9d\u00e9ral de la sant\u00e9 publique montrent clairement que les l\u00e9gionelles constituent un probl\u00e8me croissant dans toute la Suisse. (Image : EAWAG)<\/figcaption><\/figure>\n<p>Les bact\u00e9ries \u00e0 l'origine de la maladie dite du l\u00e9gionnaire s'appellent les l\u00e9gionelles. Elles se trouvent notamment dans l'eau. L'inhalation de gouttelettes d'eau finement pulv\u00e9ris\u00e9es et contamin\u00e9es est dangereuse. Cela peut se produire partout o\u00f9 de telles gouttelettes sont produites : dans les stations de lavage de voitures, les syst\u00e8mes de refroidissement des climatiseurs ou les tours de refroidissement industrielles. Toutefois, dans certaines circonstances, les l\u00e9gionelles peuvent \u00e9galement se former dans l'eau potable.<\/p>\n<p>Les fontaines, les bains de vapeur et les douches deviennent ainsi une source potentielle d'infection.<\/p>\n<p><strong>Agents pathog\u00e8nes dans les b\u00e2timents<\/strong><\/p>\n<p>Mais comment les agents pathog\u00e8nes parviennent-ils en fait dans les installations des b\u00e2timents ? Dans les stations centrales de traitement de l'eau potable qui approvisionnent les communes et les villes, la plupart des bact\u00e9ries et des nutriments sont \u00e9limin\u00e9s de l'eau. La concentration reste \u00e9galement faible dans le r\u00e9seau de distribution, c'est-\u00e0-dire les canalisations qui am\u00e8nent l'eau potable aux b\u00e2timents. \"Mais c'est l\u00e0 que cela devient probl\u00e9matique\", explique Frederik Hammes du d\u00e9partement de microbiologie environnementale de l'Institut de recherche sur l'eau Eawag. En effet, dans les b\u00e2timents, l'eau est chauff\u00e9e et des l\u00e9gionelles peuvent ainsi se former dans les conduites d'eau chaude des installations domestiques. Les agents pathog\u00e8nes se d\u00e9veloppent de mani\u00e8re optimale lorsque la temp\u00e9rature de l'eau est comprise entre 35 et 40 degr\u00e9s Celsius. Certes, les l\u00e9gionelles peuvent \u00eatre \u00e9limin\u00e9es en chauffant l'eau chaude \u00e0 60 degr\u00e9s Celsius. Mais cette temp\u00e9rature n'est que rarement atteinte, par exemple au niveau de la douchette.<\/p>\n<p>De plus, pour \u00e9conomiser de l'\u00e9nergie, les chauffe-eau de nombreux b\u00e2timents restent en dessous de 60 degr\u00e9s. Mais les l\u00e9gionelles peuvent \u00e9galement se multiplier dans les conduites d'eau froide si l'eau est r\u00e9guli\u00e8rement chauff\u00e9e \u00e0 des temp\u00e9ratures plus \u00e9lev\u00e9es. D'autres facteurs, tels que l'apport de nutriments via les mat\u00e9riaux utilis\u00e9s et un renouvellement irr\u00e9gulier ou inexistant de l'eau, sont \u00e9galement connus pour favoriser la multiplication. De nombreuses questions restent toutefois sans r\u00e9ponse : par exemple, comment la pr\u00e9sence de l\u00e9gionelles et l'infection humaine sont-elles exactement li\u00e9es ou comment peut-on analyser le plus efficacement possible les conduites d'eau potable pour d\u00e9tecter les l\u00e9gionelles.<\/p>\n<p>C'est pourquoi l'Office f\u00e9d\u00e9ral de la s\u00e9curit\u00e9 alimentaire et des affaires v\u00e9t\u00e9rinaires (OSAV), l'Office f\u00e9d\u00e9ral de l'\u00e9nergie (OFEN) et l'Office f\u00e9d\u00e9ral de la sant\u00e9 publique (OFSP) soutiennent d\u00e9sormais \u00e0 hauteur de 2,5 millions de francs le projet multidisciplinaire de quatre ans \"Lutte contre les l\u00e9gionelles dans les b\u00e2timents\" (\"Legionella control in buildings\" - LeCo), dirig\u00e9 par l'Eawag. Outre le groupe de recherche en microbiologie de l'eau potable de Frederik Hammes, la Haute \u00e9cole de Lucerne (HSLU), l'Institut tropical et de sant\u00e9 publique suisse (Swiss TPH), le Laboratoire cantonal de Zurich (KLZH) ainsi que le groupe de recherche de l'Eawag \"Agents pathog\u00e8nes et sant\u00e9 humaine\" dirig\u00e9 par Tim Julian y participent.<\/p>\n<p>Julian, en collaboration avec le Swiss TPH, veut savoir combien de l\u00e9gionelles dans l'eau des douches entra\u00eenent combien de cas de maladie. Concr\u00e8tement, les chercheurs veulent calculer, \u00e0 l'aide d'un mod\u00e8le math\u00e9matique, la probabilit\u00e9 d'une infection \u00e0 diff\u00e9rentes concentrations de l\u00e9gionelles.<\/p>\n<p>Un autre point fort du projet est l'am\u00e9lioration de l'\u00e9chantillonnage. En effet, depuis 2017, une ordonnance est entr\u00e9e en vigueur selon laquelle les douches accessibles au public ne doivent pas contenir plus de 1000 l\u00e9gionelles par litre d'eau. Mais la composition des bact\u00e9ries dans une installation d'eau potable varie et rend l'\u00e9chantillonnage complexe. \"Pour augmenter la pertinence et la comparabilit\u00e9 des \u00e9chantillons, nous devons optimiser et standardiser le pr\u00e9l\u00e8vement\", explique Franziska R\u00f6lli de l'Institut de technique du b\u00e2timent et d'\u00e9nergie de la HSLU.<\/p>\n<p>\"La sensibilisation et l'information jouent \u00e9galement un r\u00f4le important\". En effet, les sp\u00e9cialistes de l'architecture, de la planification technique, de l'installation sanitaire et de l'exploitation des b\u00e2timents ne sont souvent pas suffisamment familiaris\u00e9s avec la th\u00e9matique des l\u00e9gionelles. C'est pourquoi, outre les activit\u00e9s de recherche, le consortium du projet attache une grande importance \u00e0 la transmission des connaissances nouvellement acquises, par exemple dans le cadre d'ateliers ou de s\u00e9minaires.<\/p>\n<p><em>Une \u00e9quipe de recherche multidisciplinaire dirig\u00e9e par l'Eawag \u00e9tudie maintenant comment endiguer le danger que repr\u00e9sentent ces bact\u00e9ries dans le cadre du projet \"Lutte contre les l\u00e9gionelles dans les b\u00e2timents\" (LeCo) qui vient d'\u00eatre lanc\u00e9. Ce projet, qui durera quatre ans, a \u00e9t\u00e9 command\u00e9 par la Conf\u00e9d\u00e9ration.<\/em><\/p>\n<p><em>Plus d'informations sur <a href=\"\/\/www.eawag.ch\">www.eawag.ch<\/a> et sous <\/em><a href=\"\/\/www.eawag.ch\/leco\"><em>www.eawag.ch\/leco<\/em><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Die Erregerbakterien der so genannten Legion\u00e4rskrankheit heissen Legionellen. Sie kommen unter anderem im Wasser vor. Das Einatmen von fein zerst\u00e4ubten, kontaminierten Wassertr\u00f6pfchen ist gef\u00e4hrlich. Das kann \u00fcberall dort passieren, wo solche Tr\u00f6pfchen entstehen: in Autowaschanlagen, R\u00fcckk\u00fchlwerken von Klimaanlagen oder industriellen K\u00fchlt\u00fcrmen. Unter bestimmten Umst\u00e4nden allerdings k\u00f6nnen sich Legionellen auch im Trinkwasser bilden. Dadurch werden Springbrunnen, [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2878,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_focuskw":"Legion\u00e4rskrankheit","_yoast_wpseo_metadesc":"In der Schweiz h\u00e4ufen sich die F\u00e4lle der Legion\u00e4rskrankheit: 582 F\u00e4lle der schweren Lungenentz\u00fcndung registrierte das Bundesamt f\u00fcr Gesundheit (BAG) 2019.","articlekey":"","footnotes":""},"categories":[580],"tags":[885,1247,1615,1616,424,2333,600],"class_list":["post-2877","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sustainability","tag-bundesamt-fuer-gesundheit","tag-gebaeude","tag-legionaerskrankheit","tag-legionellen","tag-schweiz","tag-trinkwassersysteme","tag-wasser"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Legion\u00e4rskrankheit: EAWAG startet Projekt zur Legionellen-Bek\u00e4mpfung in Geb\u00e4uden - 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