title: Mycobacterium gordonae-induced humidifier lung.
abstract: BACKGROUND
  Nontuberculous mycobacteria are well known to be a cause of hot tub lung, however, to our knowledge, there exists no case report of humidifier lung induced by mycobacteria.
  
  
  METHODS
  A case of a nonimmunocompromised female patient with Mycobacterium gordonae-induced humidifier lung is described. She spontaneously recovered after discontinuing ultrasonic humidifier use. When subjected to a provocation test, she demonstrated acute respiratory distress with signs and symptoms, consistent with hypersensitivity pneumonitis. Before and after the provocation test, water in the humidifier reservoir revealed only Mycobacterium gordonae by the microbiologic analyses.
  
  
  CONCLUSIONS
  To our knowledge, this is the first report of humidifier lung induced by nontuberculous mycobacteria. Although nontuberculous mycobacteria are well-known to be agents of hot tub lung or metal working fluid lung, physicians should also consider the pathogen as a cause of hypersensitivity lung reaction associated with humidifier use.
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Morohongo 38, Moroyama-machi, Iruma-gun, Saitama, Japan. uharue@saitama-med.ac.jp.
authors.forename: Harue
authors.initials: H
authors.lastname: Utsugi
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Morohongo 38, Moroyama-machi, Iruma-gun, Saitama, Japan. yusupulm@yahoo.co.jp.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Usui
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Morohongo 38, Moroyama-machi, Iruma-gun, Saitama, Japan. vinoblancocava@gmail.co.jp.
authors.forename: Fuyumi
authors.initials: F
authors.lastname: Nishihara
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Morohongo 38, Moroyama-machi, Iruma-gun, Saitama, Japan. mkanazaw@saitama-med.ac.jp.
authors.forename: Minoru
authors.initials: M
authors.lastname: Kanazawa
authors.affiliation: Department of Respiratory Medicine, Saitama Medical University, Morohongo 38, Moroyama-machi, Iruma-gun, Saitama, Japan. favre4mn@saitama-med.ac.jp.
authors.forename: Makoto
authors.initials: M
authors.lastname: Nagata
mesh_terms: D000369:Aged, 80 and over; D000542:Alveolitis, Extrinsic Allergic / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000276:immunology; D001985:Bronchial Provocation Tests; D005260:Female; D006801:Humans; D000068998:Humidifiers; D008168:Lung / Q000000981:diagnostic imaging*; D009170:Nontuberculous Mycobacteria / Q000276:immunology*; D014057:Tomography, X-Ray Computed; D014871:Water Microbiology