Mycobacterium avium complex organisms predominantly colonize in the bathtub inlets of patients' bathrooms

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  • Nishiuchi Yukiko
    Toneyama Institute for Tuberculosis Research Osaka City University Medical School, Japan
  • Tamaru Aki
    Department of Infectious Diseases, Osaka Prefectural Institute of Public Health, Japan
  • Kitada Seigo
    National Hospital Organization Toneyama National Hospital, Japan
  • Taguri Takahiro
    National Hospital Organization Toneyama National Hospital, Japan
  • Matsumoto Sohkichi
    Department of Bacteriology, Osaka City University Graduate School of Medicine, Japan
  • Tateishi Yoshitaka
    National Hospital Organization Toneyama National Hospital, Japan Department of Bacteriology, Osaka City University Graduate School of Medicine, Japan
  • Yoshimura Mamiko
    Department of Bacteriology, Osaka City University Graduate School of Medicine, Japan
  • Ozeki Yuriko
    Department of Bacteriology, Osaka City University Graduate School of Medicine, Japan
  • Matsumura Narumi
    National Hospital Organization Toneyama National Hospital, Japan
  • Ogura Hisashi
    Department of Virology, Osaka City University Graduate School of Medicine, Japan
  • Maekura Ryoji
    National Hospital Organization Toneyama National Hospital, Japan

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  • <i>Mycobacterium avium</i> Complex Organisms Predominantly Colonize in the Bathtub Inlets of Patients’ Bathrooms

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<p>Medical treatment of pulmonary Mycobacterium avium complex (MAC) disease does not always provide curative effects and is frequently hampered by recurrence. This suggests the presence of a reservoir for MAC in the environment surrounding patients. We previously reported the recovery of MAC isolates from the residential bathrooms of outpatients. In the present study, to ascertain the colonizing sites and the possibility of an MAC reservoir in the bathrooms of patients, we tested the recovery and the genetic diversity of MAC isolates from 6 sites of specimens, including 2 additional sampling sites, inside the showerhead and the bathtub inlet, in the residential bathrooms of patients with pulmonary MAC disease. MAC isolates were recovered from 15 out of the 29 bathrooms (52%), including specimens from 14 bathtub inlets and 3 showerheads. Nearly half of these bathrooms (7/15) contained MAC strains that were identical or similar to their respective clinical isolates Additionally, in 5 out of 15 bathrooms, polyclonal colonization was revealed by pulsed-field gel electrophoresis. The results imply that colonization of MAC organisms in the bathrooms of MAC patients occurs predominantly in the bathtub inlets, and there is thus a risk of infection and/or reinfection for patients via use of the bathtub and other sites in the bathroom.<tt> </tt></p>

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