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Discordant molecular characterization results in a Mycobacterium avium complex strain isolated from an AIDS patient

¹Section of Microbiology and Infectious Diseases, Kaohsiung Veterans General Hospital, 386 Ta-Chung 1st Rd, Kaohsiung, Taiwan ²Department of Medical Technology, Foo-Yin Institute of Technology, Kaohsiung County, Taiwan ³Graduate Institute of Environmental Education, National Kaohsiung Normal University, Kaohsiung County, Taiwan ⁴Dept of Internal Medicine, National Yang-Ming University, Taipei, Taiwan

Correspondence Yung-Ching Liu ycliu{at}isca.vghks.gov.tw

Received June 30, 2004
Accepted March 11, 2005

This report describes an unusual strain of Mycobacterium avium complex isolated from the sputum of an immunocompromised AIDS patient, which did not react with the MAC probe of the BDProbe Tec system, but was identified as Mycobacterium intracellulare by 16S rRNA gene sequencing. Its PCR restriction-enzyme analysis pattern was compatible with an allelic variant of M. avium. It was scotochromogenic, slow-growing and phenotypically identified as Mycobacterium scrofulaceum. Its clinical significance is not certain.