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Legionella are the causative agents of the Legionnaires' disease (lung infection). These bacteria are growing in water distribution systems and infection is produced by inhalation of contaminated aerosols. Fifty-eight different species have been described until Y2012 but 90% of infections are due to L. pneumophila. We thank Dr. Valeria Gaia (Cantonal Institute of Microbiology, Bellinzona, Switzerland, ) for some strains of Legionella presented in
