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  • Title: [A case of environmental infection with pulmonary Mycobacterium avium complex disease from a residential bathroom of a patient suggested by variable-number tandem-repeat typing of Mycobacterium avium tandem repeat loci].
    Author: Taga S, Niimi M, Kurokawa K, Nakagawa T, Ogawa K.
    Journal: Kekkaku; 2012 May; 87(5):409-14. PubMed ID: 22693875.
    Abstract:
    A 63-year-old woman was referred to our hospital because of bilateral infiltrations and nodular opacities in her chest radiograph taken in the mass radiography screening in September 2010. The chest computed tomography showed patchy infiltrations with bronchiectasis in the lower lung fields on both sides. She was diagnosed with pulmonary Mycobacterium avium complex (MAC) disease based on the bacteria recovered from the sputum and the bronchoalveolar lavage fluid. To elucidate an environmental MAC source, we investigated her home, and isolated M. avium and M. gordonae from the bathtub and shower tap, respectively, in her residential bathroom. Analysis of the hsp65-PRA variants digested with BamHI and some insertion sequences showed that the clinical strains recovered from sputum and strains from the bathtub were M. avium subsp. hominissuis. A dendrogram of the Mycobacterium avium tandem repeat loci variable-number tandem-repeat (MATR-VNTR) analysis of the MAC strains showed that the bathtub strains formed a polyclonal colonization, and that 1 of the 5 MATR-VNTR patterns was identical to the corresponding pattern of the sputum strain from the patient. In conclusion, we believe that the residential bathroom of the patient was the environmental source of her pulmonary MAC disease, as has been previously reported.
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