title: In search of the cause of legionnaires' disease.
mesh_terms: D000389:Air Conditioning; D006801:Humans; D007877:Legionnaires' Disease / Q000209:etiology* / Q000635:transmission; D010414:Pennsylvania; D014874:Water Pollutants, Chemical / Q000032:analysis; D014881:Water Supply / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical