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Detection of Pontiac fever is a marker of an environmental contamination by<jats:italic>Legionella<\/jats:italic>and should thereby call for prevention measures in order to prevent outbreak of Legionnaire's disease. The objective of this study is to propose an operational definition of Pontiac fever that is amenable to epidemiological surveillance and investigation in a non epidemic setting.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A population of 560 elderly subjects residing in 25 nursing homes was followed during 4 months in order to assess the daily incidence of symptoms associated, in the literature, with Pontiac fever. The water and aerosol of one to 8 showers by nursing home were characterized combining conventional bacterial culture of<jats:italic>Legionella<\/jats:italic>and the Fluorescence In Situ Hybridization (FISH) technique that used oligonucleotides probes specific for<jats:italic>Legionellaceae<\/jats:italic>. A definition of Pontiac fever was devised based on clinical symptoms described in epidemic investigations and on their timing after the exposure event. The association between incidence of Pontiac fever and shower contamination levels was evaluated to test the relevance of this definition.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The proposed definition of Pontiac fever associated the following criteria: occurrence of at least one symptom among headache, myalgia, fever and shivers, possibly associated with other 'minor' symptoms, within three days after a shower contaminated by<jats:italic>Legionella<\/jats:italic>, during a maximum of 8 days (minimum 2 days). 23 such cases occurred during the study (incidence rate: 0.125 cases per person-year [95% CI: 0.122\u20130.127]). A concentration of<jats:italic>Legionella<\/jats:italic>in water equal to or greater than 10<jats:sup>4<\/jats:sup>.L<jats:sup>-1<\/jats:sup>(FISH method) was associated with a significant increase of incidence of Pontiac fever (p = 0.04).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Once validated in other settings, the proposed definition of Pontiac fever might be used to develop epidemiological surveillance and help draw attention on sources of<jats:italic>Legionella<\/jats:italic>.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1471-2458-6-112","type":"journal-article","created":{"date-parts":[[2006,4,28]],"date-time":"2006-04-28T19:52:09Z","timestamp":1146253929000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Pontiac fever: an operational definition for epidemiological studies"],"prefix":"10.1186","volume":"6","author":[{"given":"Paul","family":"Tossa","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magali","family":"Deloge-Abarkan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Denis","family":"Zmirou-Navier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philippe","family":"Hartemann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laurence","family":"Mathieu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2006,4,28]]},"reference":[{"key":"409_CR1","first-page":"607","volume":"57","author":"K Pancer","year":"2003","unstructured":"Pancer K, Stypulkowska-Misiurewicz H: Pontiac fever \u2013 non-pneumonic legionellosis. 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